front: fix osm layers render

[clarani]

closes #5849

The OSM layers need to be reloaded once the map is loaded (not only when the map style changes).

[codecov]

Codecov Report

Attention: 32 lines in your changes are missing coverage. Please review.

Comparison is base (f3abe90) 26.51% compared to head (76ea95b) 26.51%.
Report is 2 commits behind head on dev.

Files	Patch %	Lines
...ainschedule/components/ManageTrainSchedule/Map.tsx	0.00%	13 Missing ⚠️
front/src/applications/referenceMap/Map.tsx	0.00%	10 Missing ⚠️
...mulationResult/components/SimulationResultsMap.tsx	0.00%	5 Missing ⚠️
front/src/common/Map/Layers/OSM.tsx	0.00%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #6039      +/-   ##
============================================
- Coverage     26.51%   26.51%   -0.01%     
  Complexity     2117     2117              
============================================
  Files           930      930              
  Lines        122714   122733      +19     
  Branches       2669     2669              
============================================
  Hits          32542    32542              
- Misses        88595    88614      +19     
  Partials       1577     1577              

Flag	Coverage Δ
core	78.97% <ø> (ø)
editoast	74.55% <ø> (ø)
front	9.32% <0.00%> (-0.01%)	⬇️
gateway	2.75% <ø> (ø)

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