Change Input box to slider on Grayscale Dim level setting

[SpecialAro]

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Description of Change

Change Input box to slider on Grayscale Dim level setting

Motivation and Context

The input box on settings to change the Grayscale Dim level was ugly. Saw that it was possible to use a Slider instead, so raising this PR to change it.

Screenshots

Before:	After:

Checklist

• My pull request is properly named
• The changes respect the code style of the project (npm run prepare-code)
• npm test passes
• I tested/previewed my changes locally

Release Notes

Change Input box to slider on Grayscale Dim level setting