Fixed syntax error in new XFS quota code.

Author: Till Brehm

server/plugins-available/apache2_plugin.inc.php

@@ -886,7 +886,7 @@ function update($event_name, $data) {
           $file_system = explode(" ", $df_output)[0];
           $primitive_root = explode(" ", $df_output)[1];
 
-          if ( $file_system , array('ext2','ext3','ext4') ) {
+		  if ( in_array($file_system , array('ext2','ext3','ext4'), true) ) {
             exec('setquota -u '. $username . ' ' . $blocks_soft . ' ' . $blocks_hard . ' 0 0 -a &> /dev/null');
             exec('setquota -T -u '.$username.' 604800 604800 -a &> /dev/null');
           } elseif ($file_system == 'xfs') {