[FEAT]: Touchbar uses OLED, darker background should be better

[ImBIOS]

Clear and concise description of the problem

The current state when the mic is muted is the background color is bright red.

Suggested solution

Learning from how the factory speaker mute is working, it should be better just to use the slash mark to determine whether mute-me is active or not.

Alternative

No response

Additional context

No response

Validations

• Follow our Code of Conduct
• Read the Contributing Guide.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.