basetransform: Always intersect the suggested sink caps with the peer caps
basetransform: Always intersect the suggested sink caps with the peer caps

This makes sure that we get correct and complete caps. The suggested caps
could be incomplete, e.g. video/x-raw-rgb without any fields, and by
intersecting with the peer caps we get something usable.

Fixes bug #662199.

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