fix cast_bytes_like_as_duration encoding failed

tidb> CREATE TABLE t0(c0 BLOB(10));
Query OK, 0 rows affected (0.954 sec)

tidb> INSERT INTO t0(c0) VALUES (unhex('926B'));
Query OK, 1 row affected (0.101 sec)

tidb> SELECT t0.c0 FROM t0 WHERE CAST(REVERSE(t0.c0) AS TIME);
Empty set, 1 warning (0.012 sec)

tidb> show warnings;
+---------+------+-----------------------------------------------------------+
| Level   | Code | Message                                                   |
+---------+------+-----------------------------------------------------------+
| Warning | 1292 | evaluation failed: Truncated incorrect TIME value: 'k�'   |
+---------+------+-----------------------------------------------------------+
1 row in set (0.000 sec)

Fix casting bytes to time encoding failed