tst_signalspy: don't wait for window activation

The test doesn't need it; qWaitForWindowExposed is sufficient.

Fixes: QTBUG-104022
Pick-to: 6.2 6.3 6.4
Change-Id: I7e818b2f377bf5798e881100c555d54482ee3dbf
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>

tests/auto/quicktest/signalspy/tst_signalspy.cpp

@@ -54,7 +54,7 @@ void tst_SignalSpy::testCount()
         window.resize(200, 200);
         window.setSource(url);
         window.show();
-        QVERIFY(QTest::qWaitForWindowActive(&window));
+        QVERIFY(QTest::qWaitForWindowExposed(&window));
         QVERIFY(window.rootObject() != nullptr);
 
         QObject *mouseSpy = window.rootObject()->findChild<QObject *>("mouseSpy");