This is the standard way to call base class methods in Python 3 and
it is shorter than the custom one used now.
Task-number: QTBUG-83488
Pick-to: 6.2
Change-Id: Ifaff591a46e92148fbf514856109ff794a50c9f7
Reviewed-by: Cristian Maureira-Fredes <cristian.maureira-fredes@qt.io>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>