task250119_shortcutContext() remove setActiveWindow()

2f6fe3a268 has made calls to
QApplicationPrivate::setActiveWindow() redundant.

Remove redundant calls.

Task-number: QTBUG-121488
Change-Id: Ie98bdf64973eeac91dd914af7af347cccb0ad5d3
Reviewed-by: Axel Spoerl <axel.spoerl@qt.io>

tests/auto/widgets/graphicsview/qgraphicswidget/tst_qgraphicswidget.cpp

@@ -2694,7 +2694,6 @@ void tst_QGraphicsWidget::task250119_shortcutContext()
     QGraphicsView view;
     view.setScene(&scene);
     view.show();
-    QApplicationPrivate::setActiveWindow(&view);
     QTRY_COMPARE(QApplication::activeWindow(), (QWidget*)&view);