remove linking via admin_centre role

The admin_centre role is for the seat of government which is not
the same as the administrative entity. This is mostly used
correctly these days, so avoid matching by that role.

sql/functions/placex_triggers.sql

@@ -220,33 +220,6 @@ BEGIN
     END LOOP;
   END IF;
 
-  -- Search for relation members with role admin_center.
-  IF bnd.osm_type = 'R' and bnd_name is not null
-     and relation_members is not null
-  THEN
-    FOR rel_member IN
-      SELECT get_rel_node_members(relation_members,
-                                ARRAY['admin_center','admin_centre']) as member
-    LOOP
-    --DEBUG: RAISE WARNING 'Found admin_center member %', rel_member.member;
-      FOR linked_placex IN
-        SELECT * from placex
-        WHERE osm_type = 'N' and osm_id = rel_member.member
-          and class = 'place'
-      LOOP
-        -- For an admin centre we also want a name match - still not perfect,
-        -- for example 'new york, new york'
-        -- But that can be fixed by explicitly setting the label in the data
-        IF bnd_name = make_standard_name(linked_placex.name->'name')
-           AND bnd.rank_address = linked_placex.rank_address
-        THEN
-          RETURN linked_placex;
-        END IF;
-          --DEBUG: RAISE WARNING 'Linked admin_center';
-      END LOOP;
-    END LOOP;
-  END IF;
-
   -- Name searches can be done for ways as well as relations
   IF bnd_name is not null THEN
     --DEBUG: RAISE WARNING 'Looking for nodes with matching names';