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

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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

Additional details and impacted files

```diff @@ 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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