move ordering out of getNearFeatures

The two places where the function is called have different ordering
requirement.

sql/functions/postcode_triggers.sql

@@ -27,8 +27,8 @@ BEGIN
     NEW.parent_place_id = 0;
     FOR location IN
       SELECT place_id
-        FROM getNearFeatures(partition, NEW.geometry, NEW.rank_search, '{}'::int[])
-        WHERE NOT isguess ORDER BY rank_address DESC LIMIT 1
+        FROM getNearFeatures(partition, NEW.geometry, NEW.rank_search)
+        WHERE NOT isguess ORDER BY rank_address DESC, distance asc LIMIT 1
     LOOP
         NEW.parent_place_id = location.place_id;
     END LOOP;