front: fix number of steps color in import train schedule

[RomainValls]

close #10898

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.47%. Comparing base (2f1856a) to head (dfc8d0b).
Report is 63 commits behind head on dev.

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Additional details and impacted files

@@            Coverage Diff             @@
##              dev   #10902      +/-   ##
==========================================
- Coverage   82.47%   82.47%   -0.01%     
==========================================
  Files        1084     1084              
  Lines      107478   107478              
  Branches      739      739              
==========================================
- Hits        88644    88641       -3     
- Misses      18792    18795       +3     
  Partials       42       42              

Flag	Coverage Δ
editoast	74.38% <ø> (-0.01%)	⬇️
front	90.31% <100.00%> (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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[SharglutDev]

Lgtm and tested ✅