Fixed min_uid bug when deleting users.

Author: tbrehm

server/plugins-available/shelluser_base_plugin.inc.php

@@ -126,7 +126,7 @@ function delete($event_name,$data) {
 
 		// Get the UID of the user
 		$userid = intval($app->system->getuid($data['old']['username']));
-		if($userid > 999) {
+		if($userid > $this->min_uid) {
 			$command = 'userdel';
 			$command .= ' '.escapeshellcmd($data['old']['username']);