front: fix electrical profile display in speedspacechart

[RomainValls]

close #10664

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.86%. Comparing base (586b13c) to head (9c9792c).
Report is 70 commits behind head on dev.

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Additional details and impacted files

@@            Coverage Diff             @@
##              dev   #10672      +/-   ##
==========================================
+ Coverage   81.83%   81.86%   +0.02%     
==========================================
  Files        1073     1061      -12     
  Lines      107058   106329     -729     
  Branches      728      737       +9     
==========================================
- Hits        87613    87047     -566     
+ Misses      19406    19242     -164     
- Partials       39       40       +1     

Flag	Coverage Δ
editoast	74.20% <ø> (-0.05%)	⬇️
front	89.47% <100.00%> (+0.10%)	⬆️
gateway	2.18% <ø> (ø)
osrdyne	3.28% <ø> (ø)
railjson_generator	87.50% <ø> (ø)
tests	?

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[Uriel-Sautron]

LGTM.

[clarani]

LGTM ✅