[RNMobile] Fix BlockCaption padding visibility

[jbinda]

Description

According to this issue this PR fixes extra spaces added below Image.

The issue is connected with the BlockCaption. See this comment for more details and this PR which bring this component.

I have noticed that it also affect Gallery and Video blocks because under the media it also uses BlockCaption component.

Please also refer to:
Related gutenberg-mobile PR
Related gutenberg-mobile issue

comment with investigation
PR on Caption refactor

Presented solution is the simplest one. However we might also consider the one I posted in the comment with investigation which is:

move that padding value to styles and connect with $block-selected-to-content variable which ensure to always align the padding with rest of the content

How has this been tested?

1. Start with below code in initial-html

/**
 * @format
 * @flow
 */

export default `
<!-- wp:group -->
<div class="wp-block-group"><div class="wp-block-group__inner-container"><!-- wp:image {"id":1,"sizeSlug":"large"} -->
<figure class="wp-block-image size-large"><img src="https://cldup.com/cXyG__fTLN.jpg" alt="" class="wp-image-1"/></figure>
<!-- /wp:image -->

<!-- wp:media-text -->
<div class="wp-block-media-text is-stacked-on-mobile"><figure class="wp-block-media-text__media"></figure><div class="wp-block-media-text__content"><!-- wp:paragraph -->
<p></p>
<!-- /wp:paragraph --></div></div>
<!-- /wp:media-text -->

<!-- wp:group -->
<div class="wp-block-group"><div class="wp-block-group__inner-container"><!-- wp:image -->
<figure class="wp-block-image"><img alt=""/></figure>
<!-- /wp:image --></div></div>
<!-- /wp:group -->

<!-- wp:video {"id":2} -->
<figure class="wp-block-video"><video controls src="https://i.cloudup.com/YtZFJbuQCE.mov"></video></figure>
<!-- /wp:video -->

<!-- wp:gallery {"ids":[1,3]} -->
<figure class="wp-block-gallery columns-2 is-cropped"><ul class="blocks-gallery-grid"><li class="blocks-gallery-item"><figure><img src="https://cldup.com/cXyG__fTLN.jpg" data-id="1" class="wp-image-1"/></figure></li><li class="blocks-gallery-item"><figure><img src="https://cldup.com/cXyG__fTLN.jpg" data-id="3" class="wp-image-3"/></figure></li></ul></figure>
<!-- /wp:gallery --></div></div>
<!-- /wp:group -->


`;

2. Change selection between blocks
3. Observe that the extra space is not visible anymore under the mentioned blocks (it is easier to observe when the Goup block which holds the block is selected - then the children got the dashed border style)

To replicate the previous behaviour fix the padding value to 12 in BlockCaption component. Then after proceeding with above you will notice extra space below mentioned blocks.

Screenshots

Before:

After:

Types of changes

Bug fix: Remove extra padding below media in Video, Image and Gallery block.

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• My code follows the accessibility standards.
• My code has proper inline documentation.
• I've included developer documentation if appropriate.
• I've updated all React Native files affected by any refactorings/renamings in this PR.

[github-actions]

Size Change: -349 B (0%)

Total Size: 865 kB

Filename	Size	Change
build/block-editor/index.js	105 kB	+116 B (0%)
build/block-editor/style-rtl.css	10.5 kB	-24 B (0%)
build/block-editor/style.css	10.5 kB	-20 B (0%)
build/block-library/editor-rtl.css	7.4 kB	-263 B (3%)
build/block-library/editor.css	7.4 kB	-264 B (3%)
build/block-library/index.js	116 kB	+22 B (0%)
build/block-library/style-rtl.css	7.51 kB	+17 B (0%)
build/block-library/style.css	7.51 kB	+17 B (0%)
build/components/style-rtl.css	15.6 kB	+36 B (0%)
build/components/style.css	15.5 kB	+38 B (0%)
build/edit-post/index.js	90.9 kB	-2 B (0%)
build/edit-post/style-rtl.css	8.53 kB	-13 B (0%)
build/edit-post/style.css	8.53 kB	-12 B (0%)
build/editor/index.js	44.6 kB	+21 B (0%)
build/editor/style-rtl.css	3.98 kB	-25 B (0%)
build/editor/style.css	3.98 kB	-25 B (0%)
build/rich-text/index.js	14.3 kB	+32 B (0%)

ℹ️ View Unchanged

Filename	Size	Change
build/a11y/index.js	1.01 kB	0 B
build/annotations/index.js	3.43 kB	0 B
build/api-fetch/index.js	3.39 kB	0 B
build/autop/index.js	2.58 kB	0 B
build/blob/index.js	620 B	0 B
build/block-directory/index.js	6.02 kB	0 B
build/block-directory/style-rtl.css	760 B	0 B
build/block-directory/style.css	760 B	0 B
build/block-library/theme-rtl.css	669 B	0 B
build/block-library/theme.css	671 B	0 B
build/block-serialization-default-parser/index.js	1.65 kB	0 B
build/block-serialization-spec-parser/index.js	3.1 kB	0 B
build/blocks/index.js	57.6 kB	0 B
build/components/index.js	191 kB	0 B
build/compose/index.js	5.76 kB	0 B
build/core-data/index.js	10.5 kB	0 B
build/data-controls/index.js	1.03 kB	0 B
build/data/index.js	8.22 kB	0 B
build/date/index.js	5.37 kB	0 B
build/deprecated/index.js	772 B	0 B
build/dom-ready/index.js	568 B	0 B
build/dom/index.js	3.06 kB	0 B
build/edit-site/index.js	4.63 kB	0 B
build/edit-site/style-rtl.css	2.51 kB	0 B
build/edit-site/style.css	2.51 kB	0 B
build/edit-widgets/index.js	4.42 kB	0 B
build/edit-widgets/style-rtl.css	2.59 kB	0 B
build/edit-widgets/style.css	2.58 kB	0 B
build/editor/editor-styles-rtl.css	325 B	0 B
build/editor/editor-styles.css	327 B	0 B
build/element/index.js	4.45 kB	0 B
build/escape-html/index.js	733 B	0 B
build/format-library/index.js	7.6 kB	0 B
build/format-library/style-rtl.css	502 B	0 B
build/format-library/style.css	502 B	0 B
build/hooks/index.js	1.92 kB	0 B
build/html-entities/index.js	622 B	0 B
build/i18n/index.js	3.48 kB	0 B
build/is-shallow-equal/index.js	710 B	0 B
build/keyboard-shortcuts/index.js	2.3 kB	0 B
build/keycodes/index.js	1.68 kB	0 B
build/list-reusable-blocks/index.js	2.99 kB	0 B
build/list-reusable-blocks/style-rtl.css	226 B	0 B
build/list-reusable-blocks/style.css	226 B	0 B
build/media-utils/index.js	4.85 kB	0 B
build/notices/index.js	1.57 kB	0 B
build/nux/index.js	3.02 kB	0 B
build/nux/style-rtl.css	616 B	0 B
build/nux/style.css	613 B	0 B
build/plugins/index.js	2.54 kB	0 B
build/primitives/index.js	1.49 kB	0 B
build/priority-queue/index.js	780 B	0 B
build/redux-routine/index.js	2.84 kB	0 B
build/server-side-render/index.js	2.54 kB	0 B
build/shortcode/index.js	1.7 kB	0 B
build/token-list/index.js	1.27 kB	0 B
build/url/index.js	4 kB	0 B
build/viewport/index.js	1.61 kB	0 B
build/warning/index.js	1.14 kB	0 B
build/wordcount/index.js	1.18 kB	0 B

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