Make tst_shortcut pass on Wayland

There was a race condition in the test, since the window
might be exposed before the event to activate the
application has been received. And the short cut is not
triggered before the application is active, which
means it could just be discarded and the window would
never be closed.

This happened consistently when testing on Wayland.

Task-number: QTBUG-91418
Change-Id: I40cb143985175f5f2b5405e9502a48475c93074a
Reviewed-by: Paul Olav Tvete <paul.tvete@qt.io>

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

@@ -74,6 +74,7 @@ void tst_QShortcut::trigger()
     new QShortcut(Qt::CTRL | Qt::Key_Q, &w, SLOT(close()));
     w.show();
     QVERIFY(QTest::qWaitForWindowExposed(&w));
+    QTRY_VERIFY(QGuiApplication::applicationState() == Qt::ApplicationActive);
     sendKey(&w, Qt::Key_Q, 'q', Qt::ControlModifier);
     QTRY_VERIFY(!w.isVisible());
 }