Fix unit test with optuna master

[keisuke-umezawa]

Contributor License Agreement

This repository (optuna-dashboard) and Goptuna share common code.
This pull request may therefore be ported to Goptuna.
Make sure that you understand the consequences concerning licenses and check the box below if you accept the term before creating this pull request.

• I agree this patch may be ported to Goptuna by other Goptuna contributors.

Reference Issues/PRs

optuna/optuna#5211

What does this implement/fix? Explain your changes.

optuna/optuna#5211 broke the unittest, and this PR will fix it.

[c-bata]

Just FYI, we temporarily disabled e2e tests on #795. Please revert that change after fixing the problem 🙇

[codecov]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Comparison is base (8c48e7e) 69.13% compared to head (522b6ff) 68.96%.
Report is 12 commits behind head on main.

Files	Patch %	Lines
optuna_dashboard/_app.py	30.00%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #793      +/-   ##
==========================================
- Coverage   69.13%   68.96%   -0.17%     
==========================================
  Files          35       35              
  Lines        2378     2388      +10     
==========================================
+ Hits         1644     1647       +3     
- Misses        734      741       +7     

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[c-bata]

LGTM!