front: disable 3D terrain when set to 0

[sim51]

See issue #5392

[codecov]

Codecov Report

Merging #5461 (585ea17) into dev (bf4e61b) will decrease coverage by 0.01%.
Report is 2 commits behind head on dev.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##                dev    #5461      +/-   ##
============================================
- Coverage     18.75%   18.75%   -0.01%     
  Complexity     2317     2317              
============================================
  Files           858      858              
  Lines        103328   103344      +16     
  Branches       2410     2410              
============================================
  Hits          19377    19377              
- Misses        82603    82619      +16     
  Partials       1348     1348              

Flag	Coverage Δ
front	7.10% <0.00%> (-0.01%)	⬇️

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Files	Coverage Δ
front/src/applications/editor/Map.tsx	0.00% <0.00%> (ø)
front/src/applications/referenceMap/Map.tsx	0.00% <0.00%> (ø)
...mulationResult/components/SimulationResultsMap.tsx	0.00% <0.00%> (ø)
...ainschedule/components/ManageTrainSchedule/Map.tsx	0.00% <0.00%> (ø)