tests: fix the error msg in default_as_expession

[zimulala]

What problem does this PR solve?

Issue Number: close #52267

Problem Summary:

What changed and how does it work?

run test [ddl/default_as_expression] err: sql:alter table t0 modify column c1 datetime DEFAULT (date_format(now(), '%Y-%m-%d'));: failed to run query
\"alter table t0 modify column c1 datetime DEFAULT (date_format(now(), '%Y-%m-%d'));\"
 around line 58,
we need(139):
alter table t0 modify column c1 datetime DEFAULT (date_format(now(), '%Y-%m-%d'));
Error 1292 (22007): Incorrect datetime value: '2024-03'

but got(139):
alter table t0 modify column c1 datetime DEFAULT (date_format(now(), '%Y-%m-%d'));
Error 1292 (22007): Incorrect datetime value: '2024-04'

Check List

Tests

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

  • I checked and no code files have been changed.

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

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Defined2014, hawkingrei

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-04-01 02:41:01.085696647 +0000 UTC m=+238922.613237186: ☑️ agreed by Defined2014.
• 2024-04-01 02:41:07.318140446 +0000 UTC m=+238928.845680986: ☑️ agreed by hawkingrei.