dotbot/frontend: fix wrong y coordinate returned on map clicked

[aabadie]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.67%. Comparing base (3144b97) to head (aef171e).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #210      +/-   ##
==========================================
- Coverage   80.74%   80.67%   -0.08%     
==========================================
  Files          26       26              
  Lines        2716     2716              
==========================================
- Hits         2193     2191       -2     
- Misses        523      525       +2     

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