basetransform: Correctly reset configuration
basetransform: Correctly reset configuration

When pool can't we use, and we fall back to default pool, we need to
correctly reset that pool configuration.

centricular/gstreamer,mparis/gstreamer,centricular/gstreamer,StreamUtils/gstreamer,StreamUtils/gstreamer,shelsonjava/gstreamer,jpakkane/gstreamer,surround-io/gstreamer,surround-io/gstreamer,Lachann/gstreamer,Lachann/gstreamer,shelsonjava/gstreamer,StreamUtils/gstreamer,mparis/gstreamer,Lachann/gstreamer,jpxiong/gstreamer,centricular/gstreamer,jpxiong/gstreamer,krichter722/gstreamer,StreamUtils/gstreamer,surround-io/gstreamer,jpxiong/gstreamer,shelsonjava/gstreamer,mparis/gstreamer,mparis/gstreamer,surround-io/gstreamer,jpxiong/gstreamer,Lachann/gstreamer,mparis/gstreamer,shelsonjava/gstreamer,centricular/gstreamer,Lachann/gstreamer,krichter722/gstreamer,krichter722/gstreamer,StreamUtils/gstreamer,jpakkane/gstreamer,surround-io/gstreamer,jpxiong/gstreamer,shelsonjava/gstreamer,krichter722/gstreamer,jpakkane/gstreamer,jpakkane/gstreamer,krichter722/gstreamer,centricular/gstreamer,jpakkane/gstreamer