fix(sheets-conditional-formatting-ui): fix panel background color issue

[Gggpound]

close 3636

Pull Request Checklist

• Related tickets or issues have been linked in the PR description (or missing issue).
• Naming convention is followed (do please check it especially when you created new plugins, commands and resources).
• Unit tests have been added for the changes (if applicable).
• Breaking changes have been documented (or no breaking changes introduced in this PR).

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Playwright test results

 20 passed

Details

 20 tests across 9 suites
 4 minutes, 46 seconds
 2f9ce8c
 For more information, see full report

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 33.56%. Comparing base (34fc17d) to head (2f9ce8c).
Report is 6 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #4307   +/-   ##
=======================================
  Coverage   33.56%   33.56%           
=======================================
  Files        2505     2505           
  Lines      129100   129100           
  Branches    28896    28896           
=======================================
  Hits        43335    43335           
  Misses      85765    85765           

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