test: fix DBDebug value

The default property value is false, so the test ran under DBDebug = false.

Author: kenjis

tests/system/Database/Live/SQLite/AlterTableTest.php

@@ -51,6 +51,7 @@ protected function setUp(): void
         $config = [
             'DBDriver' => 'SQLite3',
             'database' => 'database.db',
+            'DBDebug'  => true,
         ];
 
         $this->db    = db_connect($config);