Fixed use columns as referenced columns in mysql createTable() reference...

````php
new Reference("users_friends_users_2", [
      'referencedTable' => "users",
      'columns' => ["friend_id"],
      'referencedColumns' => ["user_id"]
])
````

Expected:
```sql
CONSTRAINT `users_friends_users_2` FOREIGN KEY (`friend_id`) REFERENCES `users` (`user_id`)
```

Result:
```sql
CONSTRAINT `users_friends_users_2` FOREIGN KEY (`user_id`) REFERENCES `users` (`user_id`)
```