agnosticbin: Use allowed caps for tee checking
agnosticbin: Use allowed caps for tee checking

This way it will find a correct encoded tee even if it is stopped

Change-Id: I3174ed65424d222920e06fc808b2b8ffdbe1de8b

KurentoLegacy/gst-kurento-plugins,TribeMedia/kms-core,Kurento/kms-core,TribeMedia/kms-core,shelsonjava/kms-core,ESTOS/kms-core,KurentoLegacy/gst-kurento-plugins,Kurento/kms-core,ESTOS/kms-core,Kurento/kms-core,shelsonjava/kms-core,shelsonjava/kms-core,TribeMedia/kms-core,KurentoLegacy/gst-kurento-plugins,Kurento/kms-core,ESTOS/kms-core,ESTOS/kms-core,KurentoLegacy/gst-kurento-plugins,shelsonjava/kms-core,TribeMedia/kms-core