tst_QMenuBar::check_escKey remove QApplicationPrivate::setActiveWindow

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

Remove redundant calls.

Task-number: QTBUG-121488
Change-Id: Ib9f5844c79f37f0992076060548c30d80d20e323
Reviewed-by: Axel Spoerl <axel.spoerl@qt.io>

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

@@ -787,7 +787,6 @@ void tst_QMenuBar::check_escKey()
     const TestMenu menu = initWindowWithComplexMenuBar(w);
     w.show();
     w.setFocus();
-    QApplicationPrivate::setActiveWindow(&w);
     QVERIFY(QTest::qWaitForWindowActive(&w));
 
     QVERIFY( !menu.menus.at(0)->isActiveWindow() );