Unset wrong key, old name for same functionality

Author: h3rj4n

LSS/Array2XML.php

@@ -137,7 +137,7 @@ private static function &convert($node_name, $arr = array()) {
                 $fragment = $xml->createDocumentFragment();
                 $fragment->appendXML($arr['@xml']);
                 $node->appendChild($fragment);
-                unset($arr['@dom']);
+                unset($arr['@xml']);
                 return $node;
             }
         }