front: fix selected track display

[theocrsb]

fix #10372
fix #10414

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.50%. Comparing base (9ddc06c) to head (eb50941).
Report is 1 commits behind head on dev.

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Additional details and impacted files

@@             Coverage Diff             @@
##              dev   #10394       +/-   ##
===========================================
+ Coverage   81.61%   87.50%    +5.89%     
===========================================
  Files        1067       31     -1036     
  Lines      105535     1537   -103998     
  Branches      727        0      -727     
===========================================
- Hits        86128     1345    -84783     
+ Misses      19366      192    -19174     
+ Partials       41        0       -41     

Flag	Coverage Δ
editoast	?
front	?
gateway	?
osrdyne	?
railjson_generator	87.50% <ø> (ø)
tests	?

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