front: fix inputgroup sync behavior in allowances

[RomainValls]

close #6888

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 28.94%. Comparing base (d63f569) to head (841ada6). Report is 50 commits behind head on dev.

Files	Patch %	Lines
front/src/common/BootstrapSNCF/InputGroupSNCF.tsx	0.00%	1 Missing :warning:

Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #6946      +/-   ##
============================================
+ Coverage     28.70%   28.94%   +0.24%     
- Complexity     2238     2244       +6     
============================================
  Files          1066     1070       +4     
  Lines        131758   132535     +777     
  Branches       2665     2713      +48     
============================================
+ Hits          37815    38358     +543     
- Misses        92407    92600     +193     
- Partials       1536     1577      +41     

Flag	Coverage Δ
core	79.81% <ø> (+<0.01%)	:arrow_up:
editoast	74.76% <ø> (-0.14%)	:arrow_down:
front	9.29% <0.00%> (+0.30%)	:arrow_up:
gateway	2.45% <ø> (-0.05%)	:arrow_down:
railjson_generator	87.15% <ø> (-0.12%)	:arrow_down:
tests	83.07% <ø> (ø)

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