Fix source visibility class

[aknierim]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 16.66667% with 5 lines in your changes missing coverage. Please review.

Project coverage is 44.28%. Comparing base (db31c03) to head (0194478).

Files with missing lines	Patch %	Lines
radiotools/visibility/visibility.py	16.66%	4 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #12      +/-   ##
==========================================
- Coverage   44.88%   44.28%   -0.61%     
==========================================
  Files          10       10              
  Lines         479      481       +2     
  Branches       54       55       +1     
==========================================
- Hits          215      213       -2     
- Misses        253      256       +3     
- Partials       11       12       +1     

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