relax test

Seems to happen with 5.15 static. It's benign anyway

tests/tst_docks.cpp

@@ -5370,16 +5370,10 @@ void TestDocks::tst_floatingAction()
 
         QCOMPARE(spy1.count(), 1);
 
-#if QT_VERSION >= QT_VERSION_CHECK(5, 15, 0)
-        QCOMPARE(spy2.count(), 1);
-        QCOMPARE(spy21.count(), 1);
-#else
         // On earlier Qt versions this is flaky, but technically correct.
         // Windows can get hidden while being reparented and floating changes momentarily.
-        // This works well on 5.15 though.
         QVERIFY(spy2.count() == 1 || spy2.count() == 3);
         QVERIFY(spy21.count() == 1 || spy21.count() == 3);
-#endif
         QCOMPARE(spy11.count(), 1);
 
         QVERIFY(!dock1->isFloating());