fix(styling): Compound Filter Operator dropdown too wide in BS4

[ghiscoding]

• it seems that we need to fix a max width so that it won't go over in BS4

[codecov]

Codecov Report

Merging #598 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff             @@
##            master      #598    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files          149       149            
  Lines         9946      9946            
  Branches      3516      3370   -146     
==========================================
  Hits          9946      9946            

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