Use function return_type instead of hardcoded Geometry

client/templates/30_plproxy_functions.erb

@@ -1,5 +1,5 @@
 CREATE OR REPLACE FUNCTION <%= GEOCODER_CLIENT_SCHEMA %>._<%= name %> (user_id name, tx_id bigint, <%= params_with_type %>)
-RETURNS Geometry AS $$
+RETURNS <%= return_type %> AS $$
   CONNECT <%= GEOCODER_CLIENT_SCHEMA %>._server_conn_str();
   SELECT cdb_geocoder_server.<%= name %> (user_id, tx_id, <%= params %>);
 $$ LANGUAGE plproxy;