FIX: Using excitation type "winding" instead of "winding group"

[IreneWoyna]

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[IreneWoyna]

@gmalinve Maxwell throws an error and doesn't create a circuit already when I'm calling the method:
wdg_groups = self.excitations_by_type["Winding Group"]
(also when I'm actually not using wdg_groups)

That's why I commented it in the code.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.50%. Comparing base (f572b8a) to head (a26d53d).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5006      +/-   ##
==========================================
- Coverage   83.50%   83.50%   -0.01%     
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  Files         122      122              
  Lines       54952    54961       +9     
==========================================
+ Hits        45886    45893       +7     
- Misses       9066     9068       +2