tests: fix slow rolling stock invalid category

[flomonster]

No description provided.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.48%. Comparing base (65e3c19) to head (5152286).
Report is 20 commits behind head on dev.

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Additional details and impacted files

@@            Coverage Diff             @@
##              dev   #10908      +/-   ##
==========================================
- Coverage   82.49%   82.48%   -0.01%     
==========================================
  Files        1084     1084              
  Lines      107614   107614              
  Branches      739      739              
==========================================
- Hits        88771    88765       -6     
- Misses      18801    18807       +6     
  Partials       42       42              

Flag	Coverage Δ
editoast	74.37% <ø> (-0.02%)	⬇️
front	90.32% <ø> (ø)
gateway	2.18% <ø> (ø)
osrdyne	3.28% <ø> (ø)
railjson_generator	87.58% <ø> (ø)
tests	87.90% <ø> (ø)

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[hamz2a]

Thanks for catching that!