[autotests] Try to make translucencyTest more robust for CI

Changing a QVERIFY into QTRY_VERIFY in hope to make it more robust
on the highly flaky build.kde.org servers.

autotests/integration/effects/translucency_test.cpp

@@ -172,7 +172,7 @@ void TranslucencyTest::testMoveAfterDesktopChange()
     client->endMoveResize();
     QVERIFY(m_translucencyEffect->isActive());
     QTest::qWait(500);
-    QVERIFY(!m_translucencyEffect->isActive());
+    QTRY_VERIFY(!m_translucencyEffect->isActive());
 
     // and destroy the window again
     xcb_unmap_window(c.data(), w);