Fix wrong index in 2D mesh generation

[corentin-prigent]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 50.31%. Comparing base (4e2f535) to head (7201ff6).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #305      +/-   ##
===========================================
- Coverage    50.31%   50.31%   -0.01%     
===========================================
  Files          177      177              
  Lines        47881    47888       +7     
  Branches     10362    10361       -1     
===========================================
+ Hits         24093    24095       +2     
- Misses       16047    16052       +5     
  Partials      7741     7741              

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