core: stdcm: lower the visited margin even lower

[eckter]

Fix #10658

But it's weird we need this value to be that low, I'll open a different issue: #10713

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.92%. Comparing base (9f2a3bf) to head (4e4a179).
Report is 46 commits behind head on dev.

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Additional details and impacted files

@@            Coverage Diff             @@
##              dev   #10712      +/-   ##
==========================================
- Coverage   81.92%   81.92%   -0.01%     
==========================================
  Files        1079     1079              
  Lines      107274   107274              
  Branches      737      737              
==========================================
- Hits        87882    87879       -3     
- Misses      19352    19355       +3     
  Partials       40       40              

Flag	Coverage Δ
editoast	74.20% <ø> (-0.01%)	⬇️
front	89.47% <ø> (ø)
gateway	2.18% <ø> (ø)
osrdyne	3.28% <ø> (ø)
railjson_generator	87.50% <ø> (ø)
tests	88.14% <ø> (ø)

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