tst_QListView::shiftSelectionWithItemAlignment remove setActiveWindow()

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

Remove redundant calls.

Task-number: QTBUG-121488
Change-Id: I7cf230e46588a47a972dff8f4e40217390dcacc1
Reviewed-by: Axel Spoerl <axel.spoerl@qt.io>

tests/auto/widgets/itemviews/qlistview/tst_qlistview.cpp

@@ -1808,7 +1808,6 @@ void tst_QListView::shiftSelectionWithItemAlignment()
     view.resize(300, view.sizeHintForRow(0) * items.size() / 2 + view.horizontalScrollBar()->height());
 
     view.show();
-    QApplicationPrivate::setActiveWindow(&view);
     QVERIFY(QTest::qWaitForWindowActive(&view));
     QCOMPARE(static_cast<QWidget *>(&view), QApplication::activeWindow());