Make max_points_per_cell work with templates

[efaulhaber]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 88.88889% with 1 line in your changes missing coverage. Please review.

Project coverage is 88.13%. Comparing base (26c98ba) to head (8cb8584).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/nhs_grid.jl	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #76      +/-   ##
==========================================
- Coverage   88.19%   88.13%   -0.06%     
==========================================
  Files          15       15              
  Lines         483      489       +6     
==========================================
+ Hits          426      431       +5     
- Misses         57       58       +1     

Flag	Coverage Δ
unit	88.13% <88.88%> (-0.06%)	⬇️

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