ddl: correct the errno of database read only | tidb-test=release-8.5.2

[fzzf678]

What problem does this PR solve?

Issue Number: ref #62122

Problem Summary:

What changed and how does it work?

It's my mistake use the error number 3809 of db read only which is incorrect and inconsistent with mysql 🤦‍♂️. Should follow mysql's 3989:

mysql> alter schema test read only 1;
Query OK, 1 row affected (0.01 sec)

mysql> drop database test;
ERROR 3989 (HY000): Schema 'test' is in read only mode.
mysql> select version();
+-----------+
| version() |
+-----------+
| 8.0.31    |
+-----------+
1 row in set (0.00 sec)

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

[tiprow]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (feature/release-8.5-read_only@d209de2). Learn more about missing BASE report.

Additional details and impacted files

@@                        Coverage Diff                         @@
##             feature/release-8.5-read_only     #64788   +/-   ##
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  Hits                                     ?     347478           
  Misses                                   ?      81706           
  Partials                                 ?      21379           

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integration	50.3217% <ø> (?)
unit	72.6676% <ø> (?)

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Components	Coverage Δ
dumpling	52.9278% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	63.0012% <0.0000%> (?)

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[fzzf678]

/retest

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: joechenrh
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