Use inline styles for menubar component

[tvdeyen]

What is this pull request for?

Since we use shadow dom anyway we can just inline the styles and remove the necessity to precompile it.

Screenshots

closed

open

localized

open focus

Checklist

• I have followed Pull Request guidelines
• I have added a detailed description into each commit message

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.95%. Comparing base (70b0d49) to head (98ca8f8).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2893   +/-   ##
=======================================
  Coverage   95.95%   95.95%           
=======================================
  Files         230      230           
  Lines        6258     6258           
=======================================
  Hits         6005     6005           
  Misses        253      253           

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