Fix order_by param in Data_Source

SE/se-lib/Data_Source.php

@@ -597,6 +597,7 @@ class Data_Source {
 		$sql->limit = V::get('limit', $this->_default_sql_limit, $params, 'int');
 		$sql->offset = V::get('limitstart', 0, $params, 'int');
 		$sql->orderBy = '';
+		$sql->_orderBy = V::get('order_by', '', $params);
 		$sql->_sortBy = V::get('sortBy', '', $params);
 		if ($sql->_sortBy) {// ID A,COL_X D,COL_Y A,...
 			$sql->_sortByList = array();