Allow overriding false roles in qualname_overrides

[flying-sheep]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 95.38462% with 3 lines in your changes missing coverage. Please review.

Project coverage is 99.41%. Comparing base (7578770) to head (2df3785).
Report is 15 commits behind head on main.

Files with missing lines	Patch %	Lines
src/scanpydoc/elegant_typehints/_role_mapping.py	95.45%	2 Missing ⚠️
src/scanpydoc/elegant_typehints/__init__.py	87.50%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##              main     #192      +/-   ##
===========================================
- Coverage   100.00%   99.41%   -0.59%     
===========================================
  Files           15       16       +1     
  Lines          465      515      +50     
===========================================
+ Hits           465      512      +47     
- Misses           0        3       +3     

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