Fixed #3835 Delete MailBackup not working - Log shows a warning about SQL I...

Till Brehm

2016-04-20 86853d4d0fd66c277746e9e0cf07fbecbfbbc362

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ALTER TABLE `web_domain` ADD `seo_redirect` VARCHAR( 255 ) default NULL AFTER `redirect_path`;
ALTER TABLE `web_folder_user` ADD `server_id` INT( 11 ) NOT NULL DEFAULT '0' AFTER `sys_perm_other`;