### What changes were proposed in this pull request?
This PR help find correct bound of bracketed comment in spark-sql.
Here is the log for UT of SPARK-33100 in CliSuite before:
```
2021-01-05 13:22:34.768 - stdout> spark-sql> /* SELECT 'test';*/ SELECT 'test';
2021-01-05 13:22:41.523 - stderr> Time taken: 6.716 seconds, Fetched 1 row(s)
2021-01-05 13:22:41.599 - stdout> test
2021-01-05 13:22:41.6 - stdout> spark-sql> ;;/* SELECT 'test';*/ SELECT 'test';
2021-01-05 13:22:41.709 - stdout> test
2021-01-05 13:22:41.709 - stdout> spark-sql> /* SELECT 'test';*/;; SELECT 'test';
2021-01-05 13:22:41.902 - stdout> spark-sql> SELECT 'test'; -- SELECT 'test';
2021-01-05 13:22:41.902 - stderr> Time taken: 0.129 seconds, Fetched 1 row(s)
2021-01-05 13:22:41.902 - stderr> Error in query:
2021-01-05 13:22:41.902 - stderr> mismatched input '<EOF>' expecting {'(', 'ADD', 'ALTER', 'ANALYZE', 'CACHE', 'CLEAR', 'COMMENT', 'COMMIT', 'CREATE', 'DELETE', 'DESC', 'DESCRIBE', 'DFS', 'DROP', 'EXPLAIN', 'EXPORT', 'FROM', 'GRANT', 'IMPORT', 'INSERT', 'LIST', 'LOAD', 'LOCK', 'MAP', 'MERGE', 'MSCK', 'REDUCE', 'REFRESH', 'REPLACE', 'RESET', 'REVOKE', 'ROLLBACK', 'SELECT', 'SET', 'SHOW', 'START', 'TABLE', 'TRUNCATE', 'UNCACHE', 'UNLOCK', 'UPDATE', 'USE', 'VALUES', 'WITH'}(line 1, pos 19)
2021-01-05 13:22:42.006 - stderr>
2021-01-05 13:22:42.006 - stderr> == SQL ==
2021-01-05 13:22:42.006 - stderr> /* SELECT 'test';*/
2021-01-05 13:22:42.006 - stderr> -------------------^^^
2021-01-05 13:22:42.006 - stderr>
2021-01-05 13:22:42.006 - stderr> Time taken: 0.226 seconds, Fetched 1 row(s)
2021-01-05 13:22:42.006 - stdout> test
```
The root cause is that the insideBracketedComment is not accurate.
For `/* comment */`, the last character `/` is not insideBracketedComment and it would be treat as beginning of statements.
In this PR, this issue is fixed.
### Why are the changes needed?
To fix the issue described above.
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
Existing UT
Closes#31054 from turboFei/SPARK-33100-followup.
Authored-by: fwang12 <fwang12@ebay.com>
Signed-off-by: Takeshi Yamamuro <yamamuro@apache.org>
7b06acc28b