Fix: restaurant's timeline background

[peucastro]

Closes #1488
Added an overlayColor to the days_of_week_bar_tab widget to correct the restaurant's timeline background.

Screenshots

Before

Screencast.from.2025-02-26.13-50-02.mp4

After

Screencast.from.2025-02-26.13-50-18.mp4

Review checklist

• Terms and conditions reflect the current change
• Contains enough appropriate tests
• If aimed at production, writes a new summary in whatsnew/whatsnew-pt-PT
• Properly adds an entry in changelog.md with the change
• If PR includes UI updates/additions, its description has screenshots
• Behavior is as expected
• Clean, well-structured code

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 11%. Comparing base (283b95a) to head (3d8a694).
Report is 14 commits behind head on ui/redesign.

Additional details and impacted files

@@             Coverage Diff             @@
##           ui/redesign   #1500   +/-   ##
===========================================
+ Coverage           11%     11%   +1%     
===========================================
  Files              269     270    +1     
  Lines             7780    7785    +5     
===========================================
+ Hits               817     818    +1     
- Misses            6963    6967    +4