The query block within the `read_from_storage` hint is not being applied

## Bug Report

Please answer these questions before submitting your issue. Thanks!

### 1. Minimal reproduce step (Required)
```
create table t(a int, b int);
select /*+ read_from_storage(tikv[t1, t2@sel_2]), hash_join_build(t2@sel_2) */ a from t t1 where t1.a in (select a from t t2);
```

### 2. What did you expect to see? (Required)
No warning is generated.

### 3. What did you see instead (Required)
```
mysql> show warnings;
+---------+------+---------------------------------------------------------------------------------------------------------------------------------------------+
| Level | Code | Message |
+---------+------+---------------------------------------------------------------------------------------------------------------------------------------------+
| Warning | 1815 | There are no matching table names for (t2) in optimizer hint /*+ READ_FROM_STORAGE(tikv[t1, t2]) */. Maybe you can use the table alias name |
+---------+------+---------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)
```

### 4. What is your TiDB version? (Required)

latest master