The behavior of `NO_UNSIGNED_SUBTRACTION` is not consistent with MySQL

## Bug Report

Please answer these questions before submitting your issue. Thanks!

### 1. Minimal reproduce step (Required)

```sql
SET SQL_MODE='NO_UNSIGNED_SUBTRACTION'; CREATE TABLE t15 (a INT SIGNED, b INT UNSIGNED); INSERT INTO t15 VALUES (10, 20); SELECT * FROM t15 WHERE a - b < 0; DROP TABLE t15; SET SQL_MODE=default;
```

### 2. What did you expect to see? (Required)

```
mysql> SET SQL_MODE='NO_UNSIGNED_SUBTRACTION'; CREATE TABLE t15 (a INT SIGNED, b INT UNSIGNED); INSERT INTO t15 VALUES (10, 20); SELECT * FROM t15 WHERE a - b < 0; DROP TABLE t15; SET SQL_MODE=default;
Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.06 sec)

Query OK, 1 row affected (0.01 sec)

+------+------+
| a | b |
+------+------+
| 10 | 20 |
+------+------+
1 row in set (0.00 sec)

Query OK, 0 rows affected (0.02 sec)

Query OK, 0 rows affected (0.00 sec)
```

### 3. What did you see instead (Required)

```

mysql> SET SQL_MODE='NO_UNSIGNED_SUBTRACTION'; CREATE TABLE t15 (a INT SIGNED, b INT UNSIGNED); INSERT INTO t15 VALUES (10, 20); SELECT * FROM t15 WHERE a - b < 0; DROP TABLE t15; SET SQL_MODE=default;
Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.06 sec)

Query OK, 1 row affected (0.01 sec)

ERROR 1690 (22003): BIGINT value is out of range in '(10 - 20)'
Query OK, 0 rows affected (0.07 sec)

Query OK, 0 rows affected (0.00 sec)
```

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