🐛 Fix get_resolution using coarse GCI

[H0R5E]

When using the coarse GCI to calculate the required resolution using get_resolution, $h_1$ was set to the fine grid resolution, rather than the coarse grid.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.75%. Comparing base (0c39bef) to head (c91770c).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #16      +/-   ##
==========================================
+ Coverage   92.73%   92.75%   +0.01%     
==========================================
  Files           4        4              
  Lines         482      483       +1     
==========================================
+ Hits          447      448       +1     
  Misses         35       35              

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