tst_QListView::moveLastRow remove QApplicationPrivate::setActiveWindow

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

Remove redundant calls.

Task-number: QTBUG-121488
Change-Id: I72a5b4ae7f47374cd6b84b7c212a93b6d1e2f607
Reviewed-by: Axel Spoerl <axel.spoerl@qt.io>

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

@@ -2811,7 +2811,6 @@ void tst_QListView::moveLastRow()
     view.setViewMode(QListView::IconMode);
     view.show();
 
-    QApplicationPrivate::setActiveWindow(&view);
     QVERIFY(QTest::qWaitForWindowActive(&view));
 
     QModelIndex sourceParent = model.index(0, 0);