preset: remove variable not read
preset: remove variable not read

https://bugzilla.gnome.org/show_bug.cgi?id=686659

cablelabs/gstreamer,surround-io/gstreamer,collects/gstreamer,surround-io/gstreamer,lovebug356/gstreamer,Lachann/gstreamer,Lachann/gstreamer,krichter722/gstreamer,mparis/gstreamer,mparis/gstreamer,krichter722/gstreamer,StreamUtils/gstreamer,StreamUtils/gstreamer,cfoch/gstreamer,jpakkane/gstreamer,mparis/gstreamer,mparis/gstreamer,surround-io/gstreamer,collects/gstreamer,centricular/gstreamer,justinjoy/gstreamer,cablelabs/gstreamer,lovebug356/gstreamer,jpxiong/gstreamer,jpakkane/gstreamer,justinjoy/gstreamer,justinjoy/gstreamer,centricular/gstreamer,collects/gstreamer,krieger-od/gstreamer,surround-io/gstreamer,lovebug356/gstreamer,shelsonjava/gstreamer,lubosz/gstreamer,Lachann/gstreamer,ensonic/gstreamer,StreamUtils/gstreamer,jpxiong/gstreamer,shelsonjava/gstreamer,krieger-od/gstreamer,shelsonjava/gstreamer,krichter722/gstreamer,centricular/gstreamer,krichter722/gstreamer,ensonic/gstreamer,collects/gstreamer,lubosz/gstreamer,ensonic/gstreamer,cfoch/gstreamer,cablelabs/gstreamer,shelsonjava/gstreamer,lovebug356/gstreamer,centricular/gstreamer,jpxiong/gstreamer,cfoch/gstreamer,krichter722/gstreamer,cablelabs/gstreamer,lubosz/gstreamer,jpxiong/gstreamer,surround-io/gstreamer,lovebug356/gstreamer,StreamUtils/gstreamer,lubosz/gstreamer,collects/gstreamer,jpakkane/gstreamer,StreamUtils/gstreamer,jpakkane/gstreamer,mparis/gstreamer,shelsonjava/gstreamer,krieger-od/gstreamer,cfoch/gstreamer,Lachann/gstreamer,krieger-od/gstreamer,cfoch/gstreamer,Lachann/gstreamer,ensonic/gstreamer,cablelabs/gstreamer,justinjoy/gstreamer,jpxiong/gstreamer,lubosz/gstreamer,centricular/gstreamer,krieger-od/gstreamer,justinjoy/gstreamer,jpakkane/gstreamer,ensonic/gstreamer