Remove SkipMode parameter from QSKIP.

The SkipMode parameter has been removed from the API in qtbase, so it
must be in all calls to QSKIP.

Task-number: QTBUG-21851, QTBUG-21652
Change-Id: Ib6225572a46eac7881222fdce192750b8b13ee3b
Reviewed-by: Steve Schilz <sschilz@pasco.com>
Reviewed-by: Rohan McGovern <rohan.mcgovern@nokia.com>

tests/auto/unit/qmediaimageviewerwidgets/tst_qmediaimageviewerwidgets.cpp

@@ -97,7 +97,7 @@ void tst_QMediaImageViewerWidgets::setVideoOutput()
     QTestEventLoop::instance().enterLoop(2);
 
     if (imageViewer.mediaStatus() != QMediaImageViewer::LoadedMedia)
-        QSKIP("failed to load test image", SkipSingle);
+        QSKIP("failed to load test image");
 
     QVideoWidget widget;
     QGraphicsVideoItem item;