SimpleGenerativeModel: override to() to call it on base model

[ArneBinder]

Is this really necessary?

TODO:

• check if this is not already handled by the lightning module

[codecov-commenter]

Codecov Report

❌ Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 95.45%. Comparing base (6abf673) to head (5b36bcd).
⚠️ Report is 65 commits behind head on main.

Files with missing lines	Patch %	Lines
src/pie_modules/models/simple_generative.py	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #149      +/-   ##
==========================================
- Coverage   95.49%   95.45%   -0.04%     
==========================================
  Files          61       61              
  Lines        5173     5176       +3     
==========================================
+ Hits         4940     4941       +1     
- Misses        233      235       +2     

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