refactor(deprecation): rdef has been renamed to relation_definition

cubicweb_skos/views/widgets.py

@@ -78,7 +78,7 @@ if relationwidget_imported:
         def schema_rdef(self):
             rtype, tetype, role = self.rdef
             entity = self.compute_entity()
-            return entity.e_schema.rdef(rtype, role, tetype)
+            return entity.e_schema.relation_definition(rtype, role, tetype)
 
         def preferred_languages(self):
             """Return language by order of preference."""