dbutil: fix wrong syntax for SHOW GRANTS USING

[lance6716]

What problem does this PR solve?

Issue Number: close #36564

Problem Summary:

What is changed and how it works?

use SHOW GRANTS FOR CURRENT_USER and SHOW GRANTS FOR '%s'@'%s' in two branch, so both branch we can append USING to it.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• hawkingrei
• tangenta

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[lance6716]

/cc @GMHDBJD @D3Hunter

[lance6716]

/check-issue-triage-complete

[sre-bot]

Code Coverage Details: https://codecov.io/github/pingcap/tidb/commit/1cf79281e119d100852abfa29e2a48f8bd126c2f

[hawkingrei]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: ad58f5b

[sre-bot]

TiDB MergeCI notify

CI Name	Result	Duration	Compare with Parent commit
idc-jenkins-ci-tidb/integration-common-test	🟢 all 11 tests passed	47 min	Existing passed
idc-jenkins-ci/integration-cdc-test	🟢 all 36 tests passed	28 min	Existing passed
idc-jenkins-ci-tidb/common-test	🟢 all 12 tests passed	17 min	Existing passed
idc-jenkins-ci-tidb/tics-test	🟢 all 1 tests passed	6 min 31 sec	Existing passed
idc-jenkins-ci-tidb/integration-ddl-test	🟢 all 6 tests passed	5 min 54 sec	Existing passed
idc-jenkins-ci-tidb/sqllogic-test-2	🟢 all 28 tests passed	5 min 22 sec	Existing passed
idc-jenkins-ci-tidb/sqllogic-test-1	🟢 all 26 tests passed	4 min 45 sec	Existing passed
idc-jenkins-ci-tidb/mybatis-test	🟢 all 1 tests passed	3 min 11 sec	Existing passed
idc-jenkins-ci-tidb/integration-compatibility-test	🟢 all 1 tests passed	2 min 45 sec	Existing passed
idc-jenkins-ci-tidb/plugin-test	🟢 build success, plugin test success	4min	Existing passed