front: fix odd display of filter panel in the timetable train

[theocrsb]

closes #9183

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 36.90%. Comparing base (63b3516) to head (2378663).
Report is 13 commits behind head on dev.

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Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #9184      +/-   ##
============================================
- Coverage     36.91%   36.90%   -0.02%     
  Complexity     2242     2242              
============================================
  Files          1255     1255              
  Lines        116958   116958              
  Branches       3270     3270              
============================================
- Hits          43177    43159      -18     
- Misses        71836    71854      +18     
  Partials       1945     1945              

Flag	Coverage Δ
core	74.78% <ø> (ø)
editoast	72.20% <ø> (-0.07%)	⬇️
front	15.61% <ø> (ø)
gateway	2.22% <ø> (ø)
osrdyne	2.46% <ø> (ø)
railjson_generator	87.49% <ø> (ø)
tests	86.71% <ø> (ø)

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[Caracol3]

lgtm (tested)

[clarani]

LGTM ✅