taskmanager: Drop workaround for QTBUG-59044

Fushan Wen requested to merge work/fusionfuture/QTBUG-59044 into master

The condition in ungrabMouseHack() is never satisfied, and the bug should be fixed because QQuickWindow will get a mouseReleaseEvent in the test case (http://static.davidedmundson.co.uk/qmlmousetest.tar.gz, or qmlmousetest.tar.gz with some modifications to show status in the window);


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