taskQTBUG46812_doNotLeaveMenubarHighLighted() remove setActiveWindow()

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

Remove redundant calls.

Task-number: QTBUG-121488
Change-Id: Iacaf59536ed01e34ed933976b53228a3bd2b22f1
Reviewed-by: Axel Spoerl <axel.spoerl@qt.io>

tests/auto/widgets/widgets/qmenubar/tst_qmenubar.cpp

@@ -1530,7 +1530,6 @@ void tst_QMenuBar::taskQTBUG46812_doNotLeaveMenubarHighlighted()
     initWindowWithSimpleMenuBar(mainWindow);
 
     mainWindow.show();
-    QApplicationPrivate::setActiveWindow(&mainWindow);
     QVERIFY(QTest::qWaitForWindowActive(&mainWindow));
 
     QVERIFY(!mainWindow.menuBar()->hasFocus());