reindex postcodes that loose their parents

When the parent place of a postcode is deleted, it needs to
be reindexed to get a new parent. Otherwise displaying of
results is broken.

lib-sql/functions/placex_triggers.sql

@@ -1399,6 +1399,8 @@ BEGIN
 
   {% if debug %}RAISE WARNING 'placex_delete:12 % %',OLD.osm_type,OLD.osm_id;{% endif %}
 
+  UPDATE location_postcode SET indexed_status = 2 WHERE parent_place_id = OLD.place_id;
+
   RETURN OLD;
 
 END;