Fix wrong index in 2D mesh generation

[corentin-prigent]

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 50.31%. Comparing base (4e2f535) to head (354a9c9). Report is 10 commits behind head on develop.

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    10364       +2     
===========================================
+ Hits         24093    24094       +1     
- Misses       16047    16050       +3     
- Partials      7741     7744       +3     

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