#3916 Table sys_menu_items: increase the link field limit to 512 chars

install/sql/system.sql

@@ -4444,7 +4444,7 @@ CREATE TABLE IF NOT EXISTS `sys_menu_items` (
   `name` varchar(255) NOT NULL,
   `title_system` varchar(255) NOT NULL,
   `title` varchar(255) NOT NULL,
-  `link` varchar(255) NOT NULL,
+  `link` varchar(512) NOT NULL,
   `onclick` varchar(255) NOT NULL,
   `target` varchar(255) NOT NULL,
   `icon` text NOT NULL,