Improve pattern match to not match things like webmail.example.com

Such a website symlink would trigger warnings such as:
Undefined array key "webmail.example.com" in /usr/local/ispconfig/server/lib/classes/cron.d/100-monitor_hd_quota.inc.php on line 124

Author: helmo

server/lib/classes/cron.d/100-monitor_hd_quota.inc.php

@@ -73,7 +73,7 @@ public function onRunJob() {
 			//* No Quota on this System ... 
 
 			//** Fetch the data for all users
-			$dfData = shell_exec('du -s /var/www/clients/client*/we*');
+			$dfData = shell_exec('du -s /var/www/clients/client*/web[0-9]*');
 
 			//* split into array
 			$df = explode("\n", $dfData);