Revert "tst_qwidget::activation expect fail on Win 10"

This reverts commit 8561281.

This change needs to be reverted because Windows 10 Creator's
Update doesn't fail on this test anymore during CI runs.
Reason for this is unknown.

Change-Id: Ice250ecedb14ac96fb3693b2d9884ef452a91cc2
Reviewed-by: Tony Sarajärvi <tony.sarajarvi@qt.io>
(cherry picked from commit e938150)
Reviewed-by: Jani Heikkinen <jani.heikkinen@qt.io>

tests/auto/widgets/kernel/qwidget/tst_qwidget.cpp

@@ -1869,12 +1869,6 @@ void tst_QWidget::activation()
     QCOMPARE(QApplication::activeWindow(), &widget2);
     widget2.hide();
     QTest::qWait(waitTime);
-#ifdef Q_OS_WIN
-    if (QSysInfo::kernelVersion() == "10.0.15063") {
-        QEXPECT_FAIL("", "This fails on Windows 10 Creators Update (10.0.15063)", Continue);
-        // This happens in automated Windows 10 Creators Update (10.0.15063) CI builds!
-    }
-#endif
     QCOMPARE(QApplication::activeWindow(), &widget1);
 }
 #endif // Q_OS_WIN