Fix nlanes assignment in cartography

[Grufoony]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.99%. Comparing base (d1c4459) to head (a85791e).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #506   +/-   ##
=======================================
  Coverage   83.99%   83.99%           
=======================================
  Files          54       54           
  Lines        8478     8478           
  Branches     1006     1006           
=======================================
  Hits         7121     7121           
  Misses       1340     1340           
  Partials       17       17           

Flag	Coverage Δ
unittests	83.99% <ø> (ø)

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