front: fix stdcm rolling stock image display

[Akctarus]

closes #8289

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 38.20%. Comparing base (b4dd722) to head (4a680c9).
Report is 53 commits behind head on dev.

Files with missing lines	Patch %	Lines
...lications/stdcm/components/StdcmForm/StdcmCard.tsx	0.00%	1 Missing ⚠️
...ations/stdcm/components/StdcmForm/StdcmConsist.tsx	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #9796      +/-   ##
==========================================
+ Coverage   37.79%   38.20%   +0.40%     
==========================================
  Files         994      995       +1     
  Lines       91185    91893     +708     
  Branches     1174     1189      +15     
==========================================
+ Hits        34464    35108     +644     
- Misses      56267    56331      +64     
  Partials      454      454              

Flag	Coverage Δ
editoast	73.27% <ø> (+0.25%)	⬆️
front	20.23% <0.00%> (+0.14%)	⬆️
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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[SharglutDev]

Except the last comment from @thibautsailly on the issue (padding and gradient), it works great !

[theocrsb]

LGTM and tested :)

[SharglutDev]

There doesn't seems to be a fading on the left of the image

Is it the desired effect @thibautsailly ?

[SharglutDev]

Lgtm and tested