update Rhea chemicals script to filter broad matches

[balhoff]

go-ontology/src/util/transfer_rhea_relations.sc

Line 45 in 4f35c38

case Annotation(_, Source, ("skos:narrowMatch" ^^ _) | ("skos:relatedMatch" ^^ _)) => true

The script only filters out narrow and related, but it should probably also filter out broad (only connect chemicals to GO terms when the xref is exact).