Clip video rectangle so when aspect ratio is adjusted, the image is not larger...

Clip video rectangle so when aspect ratio is adjusted, the image is not larger than the containing (window) rectagle.

src/FlightDisplay/FlightDisplayViewUVC.qml

@@ -16,8 +16,9 @@ Rectangle {
     id:                 _root
     width:              parent.width
     height:             parent.height
-    anchors.centerIn:   parent
     color:              Qt.rgba(0,0,0,0.75)
+    clip:               true
+    anchors.centerIn:   parent
 
     function adjustAspectRatio()
     {