fix(styling): Grid Menu, Col Picker labels should take full width

[ghiscoding]

• the Column Picker & Grid Menu, cols picker list labels were not center aligned and were also not taking full width
• all the commands above already take full width, so it makes sense to also make picker list behave the same

before fix

after fix

[stackblitz]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.8%. Comparing base (bfdec1e) to head (4c50060).

Additional details and impacted files

@@          Coverage Diff           @@
##           master   #1564   +/-   ##
======================================
  Coverage    99.8%   99.8%           
======================================
  Files         198     198           
  Lines       21727   21727           
  Branches     6999    6999           
======================================
  Hits        21666   21666           
  Misses         61      61           

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