Fix bad merge, bump version to 1.15.1

[HarelM]

Launch Checklist

Fix bad css merge, update changelog, prepare to release 1.15.1

• confirm your changes do not include backports from Mapbox projects (unless with compliant license)
• briefly describe the changes in this PR
• include before/after visuals or gifs if this PR includes visual changes
• write tests for all new functionality
• document any changes to public APIs
• post benchmark scores
• manually test the debug page
• apply changelog label ('bug', 'feature', 'docs', etc) or use the label 'skip changelog'
• add an entry inside this element for inclusion in the maplibre-gl-js changelog: <changelog></changelog>

[github-actions]

Bundle size report:

Size Change: -7 B
Total Size Before: 205 kB
Total Size After: 205 kB

Output file	Before	After	Change
maplibre-gl.js	196 kB	196 kB	-7 B
maplibre-gl.css	8.87 kB	8.87 kB	0 B

ℹ️ View Details

Source file	Before	After	Change
src/util/mapbox.js	3.06 kB	3.06 kB	-1 B
src/ui/map.js	6.27 kB	6.26 kB	-6 B

[HarelM]

@curran @thaddmt @Malvoz @roblabs Any chance one of you can review this? there's not much here...

[wipfli]

Looks good to me.

[wipfli]

The additional changelog message is probably due to forgetting it earlier, right?

[HarelM]

I don't know what happen when I edited the change log. I have updated it now...