Fix migrations upgrade and downgrade

+ Add option to disable auto migrate

system/migrations/38.php

@@ -1,8 +1,11 @@
 <?php
+/**
+ * @var OTS_DB_MySQL $db
+ */
 
 // 2023-11-11
 // execute highscores_ids_hidden once again, cause of settings
-$up = function () {
+$up = function () use ($db) {
 	require __DIR__ . '/20.php';
 };