*: fix data race of TestPersistScheduler

[rleungx]

What problem does this PR solve?

Issue Number: Close #7401.

What is changed and how does it work?

Only update the schedule config instead of opt.

Check List

Tests

• Unit test

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

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• CabinfeverB
• lhy1024

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[rleungx]

/merge

[ti-chi-bot]

@rleungx: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

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[ti-chi-bot]

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

Commit hash: fac5afc

[codecov]

Codecov Report

Merging #7421 (fac5afc) into master (fc578aa) will increase coverage by 0.03%.
Report is 1 commits behind head on master.
The diff coverage is n/a.

❗ Current head fac5afc differs from pull request most recent head 06a67d6. Consider uploading reports for the commit 06a67d6 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7421      +/-   ##
==========================================
+ Coverage   74.20%   74.23%   +0.03%     
==========================================
  Files         451      451              
  Lines       49385    49385              
==========================================
+ Hits        36646    36663      +17     
+ Misses       9464     9453      -11     
+ Partials     3275     3269       -6     

Flag	Coverage Δ
unittests	74.23% <ø> (+0.03%)	⬆️

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[ti-chi-bot]

@rleungx: Your PR was out of date, I have automatically updated it for you.

If the CI test fails, you just re-trigger the test that failed and the bot will merge the PR for you after the CI passes.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the ti-community-infra/tichi repository.