[FIX] application: Fix default application font on windows (QTBUG-61707) #301
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Issue
Fixes: biolab/orange3#6826
Qt5 uses obsolete MS Dlg Shell 2 'virtual' font by default.
Changes
As per musescore/MuseScore#5791 (comment)
QApplication.font("QMessageBox")
has the correct computed font so set that as the default.