sql: limit 1 for UPDATE and DELETE is not supported by the SQL standard and postgresql

(see: https://www.postgresql.org/message-id/flat/1291109101.26137.35.camel%40pcd12478 )

include/network.php

@@ -1434,7 +1434,7 @@ function discover_by_webbie($webbie) {
 			dbesc($address)
 		);
 		if($r) {
-			$r = q("update xchan set xchan_name = '%s', xchan_network = '%s', xchan_name_date = '%s' where xchan_hash = '%s' limit 1",
+			$r = q("update xchan set xchan_name = '%s', xchan_network = '%s', xchan_name_date = '%s' where xchan_hash = '%s'",
 				dbesc($fullname),
 				dbesc($network),
 				dbesc(datetime_convert()),
@@ -2328,4 +2328,4 @@ function probe_api_path($host) {
 	}
 
 	return '';
-}
+}