Make the multimedia examples less verbose

Important warnings such as missing services are still printed though.

Task-number: QTBUG-31080
Change-Id: I96fd3837c4edc58c61b97bf950b7cab05ceed014
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Christian Stromme <christian.stromme@digia.com>

examples/multimedia/video/qmlvideo/qml/qmlvideo/SceneBasic.qml

@@ -67,7 +67,6 @@ Scene {
     MouseArea {
         anchors.fill: parent
         onClicked: {
-            console.log("[qmlvideo] SceneBasic.onClicked, started = " + content.started)
             if (content.started)
                 content.stop()
             else