chore: update flashbar colors for one theme

[mxschll]

Description

Update flashbar and border colors for one theme.

How has this been tested?

Review checklist

The following items are to be evaluated by the author(s) and the reviewer(s).

Correctness

• Changes include appropriate documentation updates.
• Changes are backward-compatible if not indicated, see CONTRIBUTING.md.
• Changes do not include unsupported browser features, see CONTRIBUTING.md.
• Changes were manually tested for accessibility, see accessibility guidelines.

Security

• If the code handles URLs: all URLs are validated through the checkSafeUrl function.

Testing

• Changes are covered with new/existing unit tests?
• Changes are covered with new/existing integration tests?

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.62%. Comparing base (bc0a6c9) to head (0921574).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4839   +/-   ##
=======================================
  Coverage   97.62%   97.62%           
=======================================
  Files         956      956           
  Lines       31012    31012           
  Branches    11411    11410    -1     
=======================================
  Hits        30277    30277           
- Misses        688      728   +40     
+ Partials       47        7   -40     

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