Update a mixed optimizer test

[saitcakmak]

Summary: This test fails with changes in D66239005. Fixing it pre-emptively to keep Ax & BoTorch changes separate

Differential Revision: D66247032

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D66247032

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.74%. Comparing base (0f17048) to head (1fd2a8e).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #3090 +/- ## ======================================= Coverage 95.74% 95.74% ======================================= Files 488 488 Lines 49749 49749 ======================================= Hits 47634 47634 Misses 2115 2115 ```

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[facebook-github-bot]

This pull request has been merged in facebook/Ax@86c8bcb2c032193f0283c69bdd53181d17e91a85.