ges/ges-track-video-transition.c: fix transition of different video sizes
ges/ges-track-video-transition.c: fix transition of different video sizes

pitivi/gst-editing-services,freesteph/gst-editing-services,freesteph/gst-editing-services,cfoch/ges,MathieuDuponchelle/PitiviGes,pitivi/gst-editing-services,volodymyrrudyi/gst-editing-services,cfoch/gst-editing-services,MathieuDuponchelle/PitiviGes,MathieuDuponchelle/PitiviGes,cfoch/ges,cfoch/gst-editing-services,freesteph/gst-editing-services,pitivi/gst-editing-services,cfoch/gst-editing-services,cfoch/gst-editing-services,pitivi/gst-editing-services,volodymyrrudyi/gst-editing-services,cfoch/ges,MathieuDuponchelle/PitiviGes,volodymyrrudyi/gst-editing-services,cfoch/ges