front: fix ch suggestions update

[SarahBellaha]

Closes #10033

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Codecov Report

Attention: Patch coverage is 66.66667% with 2 lines in your changes missing coverage. Please review.

Project coverage is 81.78%. Comparing base (ceb2468) to head (025c4e1).
Report is 14 commits behind head on dev.

Files with missing lines	Patch %	Lines
front/src/reducers/osrdconf/stdcmConf/index.ts	0.00%	2 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##              dev   #10323      +/-   ##
==========================================
- Coverage   81.78%   81.78%   -0.01%     
==========================================
  Files        1073     1073              
  Lines      106578   106582       +4     
  Branches      731      731              
==========================================
+ Hits        87163    87166       +3     
- Misses      19376    19377       +1     
  Partials       39       39              

Flag	Coverage Δ
editoast	74.21% <ø> (-0.01%)	⬇️
front	89.34% <66.66%> (+<0.01%)	⬆️
gateway	2.18% <ø> (ø)
osrdyne	3.28% <ø> (ø)
railjson_generator	87.50% <ø> (ø)
tests	87.05% <ø> (ø)

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[RomainValls]

LGTM, tested 👍

[clarani]

✅ LGTM because it fixes a major bug: if a user now selects a linked train, then the ci and ch are correctly set.

However, the management of the ch suggestions is still broken. It will be solved by this issue