Don't skip tst_QWindow::windowModality_QTBUG27039 on Wayland

The test actually passes, so there's no need to skip it.

Task-number: QTBUG-66824
Change-Id: Id091776ff7ca7637fdcf0e0ced833982b5788d92
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>

tests/auto/gui/kernel/qwindow/tst_qwindow.cpp

@@ -1726,9 +1726,6 @@ void tst_QWindow::tabletEvents()
 
 void tst_QWindow::windowModality_QTBUG27039()
 {
-    if (!QGuiApplication::platformName().compare(QLatin1String("wayland"), Qt::CaseInsensitive))
-        QSKIP("Wayland: This fails. Figure out why.");
-
     QWindow parent;
     parent.setGeometry(QRect(m_availableTopLeft + QPoint(10, 10), m_testWindowSize));
     parent.show();