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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