Remove now-obsolete antibody_approval test from generics.feature.
Remove now-obsolete antibody_approval test from generics.feature.

T2DREAM/t2dream-portal,ENCODE-DCC/encoded,ClinGen/clincoded,kidaa/encoded,philiptzou/clincoded,ClinGen/clincoded,4dn-dcic/fourfront,4dn-dcic/fourfront,ENCODE-DCC/snovault,hms-dbmi/fourfront,ENCODE-DCC/snovault,hms-dbmi/fourfront,ENCODE-DCC/encoded,philiptzou/clincoded,ENCODE-DCC/encoded,ENCODE-DCC/encoded,T2DREAM/t2dream-portal,hms-dbmi/fourfront,ENCODE-DCC/snovault,ENCODE-DCC/snovault,ClinGen/clincoded,kidaa/encoded,kidaa/encoded,4dn-dcic/fourfront,hms-dbmi/fourfront,T2DREAM/t2dream-portal,kidaa/encoded,philiptzou/clincoded,ClinGen/clincoded,4dn-dcic/fourfront,kidaa/encoded,philiptzou/clincoded,hms-dbmi/fourfront,ClinGen/clincoded,philiptzou/clincoded,T2DREAM/t2dream-portal,ENCODE-DCC/snovault