Unskip tst_QApplication::testDeleteLater() on macOS

It passes locally, let's give it a shot in the CI.

Fixes: QTBUG-24318
Change-Id: I7df735bdc7963c9c1a8ad8befdc0642f796c32a1
Reviewed-by: Doris Verria <doris.verria@qt.io>
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>

tests/auto/widgets/kernel/qapplication/tst_qapplication.cpp

@@ -1335,9 +1335,6 @@ void DeleteLaterWidget::checkDeleteLater()
 
 void tst_QApplication::testDeleteLater()
 {
-#ifdef Q_OS_MAC
-    QSKIP("This test fails and then hangs on OS X, see QTBUG-24318");
-#endif
     int argc = 0;
     QApplication app(argc, nullptr);
     connect(&app, &QGuiApplication::lastWindowClosed, &app, &QCoreApplication::quit);