ges: Update for registry API change
ges: Update for registry API change

cfoch/ges,cfoch/gst-editing-services,pitivi/gst-editing-services,volodymyrrudyi/gst-editing-services,pitivi/gst-editing-services,pitivi/gst-editing-services,cfoch/gst-editing-services,volodymyrrudyi/gst-editing-services,cfoch/ges,pitivi/gst-editing-services,volodymyrrudyi/gst-editing-services,cfoch/ges,cfoch/gst-editing-services,cfoch/ges,cfoch/gst-editing-services