Remove 'enabled by' as an extension relation (#535)

Author: balhoff

minerva-converter/src/main/resources/org/geneontology/minerva/legacy/sparql/gpad-extensions.rq

@@ -72,7 +72,6 @@ VALUES ?extension_rel {
 <http://purl.obolibrary.org/obo/RO_0002315>
 <http://purl.obolibrary.org/obo/RO_0002327>
 <http://purl.obolibrary.org/obo/RO_0002332>
-<http://purl.obolibrary.org/obo/RO_0002333>
 <http://purl.obolibrary.org/obo/RO_0002334>
 <http://purl.obolibrary.org/obo/RO_0002338>
 <http://purl.obolibrary.org/obo/RO_0002339>