front: fix nge update after importing or deleting multiple trains

[RomainValls]

close #10028

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.39%. Comparing base (cae4d30) to head (a67ef86).
Report is 2 commits behind head on dev.

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Additional details and impacted files

@@            Coverage Diff             @@
##              dev   #10285      +/-   ##
==========================================
- Coverage   81.49%   81.39%   -0.10%     
==========================================
  Files        1058     1027      -31     
  Lines      104270   102741    -1529     
  Branches      722      722              
==========================================
- Hits        84973    83628    -1345     
+ Misses      19256    19072     -184     
  Partials       41       41              

Flag	Coverage Δ
editoast	73.71% <ø> (-0.03%)	⬇️
front	89.21% <100.00%> (+<0.01%)	⬆️
gateway	2.18% <ø> (ø)
osrdyne	3.28% <ø> (ø)
railjson_generator	?
tests	87.05% <ø> (ø)

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