uriclip: Fix wrong acces to object instead of its duration field
uriclip: Fix wrong acces to object instead of its duration field

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