Update the GroupedSPMe spatial variables

[NicolaCourtier]

Description

Update the default var_pts, geometry, submesh_types and spatial_methods for the GroupedSPMe model to align with the dimensionless variables used in the model.

Issue reference

Show fix

Review

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.23%. Comparing base (5281260) to head (e5dc2e7).
Report is 40 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #681   +/-   ##
========================================
  Coverage    99.23%   99.23%           
========================================
  Files           66       66           
  Lines         4817     4826    +9     
========================================
+ Hits          4780     4789    +9     
  Misses          37       37           

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