Fix regex

Author: schlessera

src/DB_Command.php

@@ -1881,7 +1881,7 @@ protected function get_current_sql_modes( $assoc_args ) {
 				$modes = array_filter(
 					array_map(
 						'trim',
-						preg_split( "/\r\n|\n|\r/|,", $stdout )
+						preg_split( "/\r\n|\n|\r|,/", $stdout )
 					)
 				);
 			}