Makes relations resource shallow (#7366).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@6184 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/views/issue_relations/show.api.rsb

@@ -2,6 +2,6 @@ api.relation do
   api.id @relation.id
   api.issue_id @relation.issue_from_id
   api.issue_to_id @relation.issue_to_id
-  api.relation_type @relation.relation_type_for(@issue)
+  api.relation_type @relation.relation_type
   api.delay @relation.delay
 end