front: fix rolling stock livery display

[Akctarus]

closes #8289

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 37.85%. Comparing base (a4daa6d) to head (306a6e2).
Report is 16 commits behind head on dev.

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Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #9757      +/-   ##
==========================================
- Coverage   37.85%   37.85%   -0.01%     
==========================================
  Files         990      990              
  Lines       90928    90966      +38     
  Branches     1176     1176              
==========================================
+ Hits        34423    34433      +10     
- Misses      56051    56079      +28     
  Partials      454      454              

Flag	Coverage Δ
editoast	73.27% <ø> (-0.04%)	⬇️
front	20.10% <ø> (-0.01%)	⬇️
gateway	2.18% <ø> (ø)
osrdyne	3.28% <ø> (ø)
railjson_generator	87.49% <ø> (ø)
tests	86.74% <ø> (ø)

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[theocrsb]

LGTM and tested :)

[SharglutDev]

Lgtm and tested, thank you, waited for that since a long time !