front: remove unused class in stdcm results

[SharglutDev]

Since a recent PR, this class isn't used anymore.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.64%. Comparing base (6b9c52f) to head (9e6ab79).
Report is 1 commits behind head on dev.

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Additional details and impacted files

@@            Coverage Diff             @@
##              dev   #10379      +/-   ##
==========================================
- Coverage   81.64%   81.64%   -0.01%     
==========================================
  Files        1066     1066              
  Lines      105692   105692              
  Branches      727      727              
==========================================
- Hits        86297    86296       -1     
- Misses      19354    19355       +1     
  Partials       41       41              

Flag	Coverage Δ
editoast	73.68% <ø> (-0.01%)	⬇️
front	89.33% <ø> (ø)
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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[Math-R]

lgtm