[WIP] There are two black backgrounds in the “Move mode” section of the Keyboard Controls in High Contrast mode

[Copilot]

Thanks for assigning this issue to me. I'm starting to work on it and will keep this PR's description up to date as I form a plan and make progress.

Original issue description:

Describe the bug
In High Contrast mode, the Move mode section under Keyboard Controls displays two black backgrounds.

Steps to reproduce the behavior:

1. Navigate to https://makecode.microbit.org/beta
2. Click on Settings → Theme → High Contrast.
3. Open any project and check the "Keyboard Controls" in Settings.
4. Observe the Move mode section.

Actual behavior
There are two black backgrounds in the “Move mode” section of the Keyboard Controls in High Contrast mode

Expected behavior
Don't display the black backgrounds in the “Move mode” section of the Keyboard Controls in High Contrast mode

Screenshots

Additional context
1.OS: Windows 11 24H2
2.Browser: Chrome, Firefox, Edge
3.makecode.microbit.org version: 7.1.50
4.Microsoft MakeCode version: 11.4.39

Fixes #6420.

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[thsparks]

Realized this is a change that'll be needed in pxt not pxt-microbit