fix(combo-box): ai-label with close style

[ariellalgilmore]

Closes #18392

before (overlapping AILabel and Close)

after (spaced out evenly)

Changelog

Changed

• update styles to look for inner wrapper first then ai-label. remove duplicate styles

Testing / Reviewing

confirm combobox ai-label is styled correctly
make sure other list-box components aren't effected with ai-label styles

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.15%. Comparing base (eee39f8) to head (4b242d6).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #18432   +/-   ##
=======================================
  Coverage   84.15%   84.15%           
=======================================
  Files         408      408           
  Lines       14443    14443           
  Branches     4641     4691   +50     
=======================================
  Hits        12155    12155           
+ Misses       2124     2123    -1     
- Partials      164      165    +1     

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