[FIX] Fix bold fonts on Qt5 on Macs (apply QTBUG-58610 fix only on Windows)

[markotoplak]

Fixes #314. I did not test how this looks on Windows, but it should not change anything since both 32 and 64-bit windows are win32

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.59%. Comparing base (cc3eacb) to head (9015f52).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #315   +/-   ##
=======================================
  Coverage   76.59%   76.59%           
=======================================
  Files         100      100           
  Lines       21217    21217           
=======================================
  Hits        16252    16252           
  Misses       4965     4965           

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[janezd]

I "fixed" it by setting QT_API to pyqt6. In every session. Annoying.

Thanks!