tst_QShortcut::context() remove QApplicationPrivate::setActiveWindow()

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

Remove redundant calls.

Task-number: QTBUG-121488
Change-Id: I650e67f626865796480c422e9d7ff7dcfd11c9ca
Reviewed-by: Axel Spoerl <axel.spoerl@qt.io>

tests/auto/widgets/kernel/qshortcut/tst_qshortcut.cpp

@@ -1064,7 +1064,6 @@ void tst_QShortcut::context()
 
     // Focus on 'other1' edit, so Active Window context should trigger
     other1->activateWindow(); // <---
-    QApplicationPrivate::setActiveWindow(other1);
     QCOMPARE(QApplication::activeWindow(), other1->window());
     QCOMPARE(QApplication::focusWidget(), static_cast<QWidget *>(other1));