Revert "Fixes ispconfig/ispconfig3#3943"

A. Täffner

2016-06-14 b8942a6e3ac3786d82d4ab5f1c340028c29e9d62

 server/plugins-available/software_update_plugin.inc.php

@@ -267,7 +267,6 @@
            $app->log('Unable to create database user'.$db_config['database_user'].' '.mysqli_error($link), LOGLEVEL_ERROR);
         }

         mysqli_query($link, "FLUSH PRIVILEGES;");
         mysqli_close($link);

      }