change all-instances query

src/wanijo/visualisation/domain.clj

@@ -7,9 +7,7 @@
    OPTIONAL MATCH
      (source)<-[:link_from]-(link:link)-[:link_to]->(target:instance),
      (target)-[:of]->(target_schema:schema)
-   WHERE
-     target IS NULL OR target <> source
-   RETURN source, link, target, schema, target_schema")
+   RETURN source, schema, link, target, target_schema")
 
 (defn all-instance-connections! []
   (neo4j/exec-query! all-instance-connections {}))