Fix reference counter incremented twice in Frame copy constructor.
Fix reference counter incremented twice in Frame copy constructor.

If the copy constructor was used, mlt_frame_close would never be called because
the reference counter would be 1. Instead, the Mlt::Propertiec destructor would
close the frame properties and the rest of the frame would never be freed.

anba8005/mlt,wideioltd/mlt,mltframework/mlt,xzhavilla/mlt,wideioltd/mlt,siddharudh/mlt,zzhhui/mlt,siddharudh/mlt,mltframework/mlt,j-b-m/mlt,siddharudh/mlt,wideioltd/mlt,mltframework/mlt,xzhavilla/mlt,xzhavilla/mlt,j-b-m/mlt,j-b-m/mlt,wideioltd/mlt,anba8005/mlt,j-b-m/mlt,anba8005/mlt,anba8005/mlt,mltframework/mlt,j-b-m/mlt,anba8005/mlt,siddharudh/mlt,mltframework/mlt,wideioltd/mlt,anba8005/mlt,j-b-m/mlt,zzhhui/mlt,anba8005/mlt,anba8005/mlt,siddharudh/mlt,wideioltd/mlt,mltframework/mlt,xzhavilla/mlt,wideioltd/mlt,zzhhui/mlt,xzhavilla/mlt,mltframework/mlt,xzhavilla/mlt,siddharudh/mlt,wideioltd/mlt,j-b-m/mlt,zzhhui/mlt,wideioltd/mlt,zzhhui/mlt,zzhhui/mlt,anba8005/mlt,xzhavilla/mlt,mltframework/mlt,j-b-m/mlt,xzhavilla/mlt,mltframework/mlt,xzhavilla/mlt,mltframework/mlt,zzhhui/mlt,siddharudh/mlt,j-b-m/mlt,zzhhui/mlt,j-b-m/mlt,siddharudh/mlt,siddharudh/mlt,zzhhui/mlt