Fix track do not blend properly when moving tracks

As reported here:
#1429

The call to inherit properties from the old transition to the new
transition was also copying the private "f0r_*" and "_ctor-" pointer
properties. This was causing the blending to break and always pass
through the b frame.

src/models/multitrackmodel.cpp

@@ -3163,7 +3163,7 @@ void MultitrackModel::moveTrack(int fromTrackIndex, int toTrackIndex)
         }
         if (videoTransitions[bTrack].is_valid()) {
             Mlt::Transition vTransition (MLT.profile(), videoTransitions[bTrack].get("mlt_service"));
-            vTransition.inherit(videoTransitions[bTrack]);
+            vTransition.set("1", videoTransitions[bTrack].get("1"));
             if (bTrack == 1) {
                 vTransition.set("disable", 1);
             } else {