fix(filters): Grid State filters should always include an operator

[ghiscoding]

No description provided.

[codecov]

Codecov Report

Merging #238 (fc87c45) into master (9aac97d) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##            master      #238    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files          207       207            
  Lines        11930     11931     +1     
  Branches      4094      3945   -149     
==========================================
+ Hits         11930     11931     +1     

Impacted Files	Coverage Δ
packages/common/src/services/filter.service.ts	100.00% <100.00%> (ø)

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