front: fix weird behavior in spreadsheet

[SarahBellaha]

Closes #5793

[codecov]

Codecov Report

Attention: 8 lines in your changes are missing coverage. Please review.

Comparison is base (e8ab630) 19.50% compared to head (4661d2a) 19.50%.

Files	Patch %	Lines
...ts/RollingStockEditor/RollingStockEditorCurves.tsx	0.00%	8 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #5798      +/-   ##
============================================
- Coverage     19.50%   19.50%   -0.01%     
  Complexity     2332     2332              
============================================
  Files           907      907              
  Lines        107109   107112       +3     
  Branches       2590     2590              
============================================
  Hits          20893    20893              
- Misses        84693    84696       +3     
  Partials       1523     1523              

Flag	Coverage Δ
front	8.38% <0.00%> (-0.01%)	⬇️

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[Math-R]

LGTM, thanks for the quick fix