fix: formset prefixes for generic inlines inside polymorphic inlines

[fdintino]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.97%. Comparing base (6c48536) to head (4f95a21).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #275      +/-   ##
==========================================
+ Coverage   78.95%   78.97%   +0.01%     
==========================================
  Files          20       20              
  Lines        2585     2587       +2     
==========================================
+ Hits         2041     2043       +2     
  Misses        544      544              

Flag	Coverage Δ
javascript	79.11% <ø> (ø)
python	78.74% <100.00%> (+0.04%)	⬆️

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Files with missing lines	Coverage Δ
nested_admin/nested.py	95.30% <100.00%> (+0.03%)	⬆️

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