[#721] Show selectielijstklasse also if it's not on the zaak

[SilviaAmAm]

Fixes #721

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 90.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 90.22%. Comparing base (ac04a96) to head (db8aef8).

Files with missing lines	Patch %	Lines
frontend/src/hooks/useFields.tsx	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #723      +/-   ##
==========================================
- Coverage   90.29%   90.22%   -0.07%     
==========================================
  Files         219      219              
  Lines        6452     6458       +6     
  Branches      697      699       +2     
==========================================
+ Hits         5826     5827       +1     
- Misses        626      631       +5     

Flag	Coverage Δ
backend	91.02% <100.00%> (+<0.01%)	⬆️
jest	33.08% <0.00%> (-0.06%)	⬇️
storybook	86.19% <85.71%> (-0.20%)	⬇️

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