Fix audio artifact component

[contramundum53]

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

What does this implement/fix? Explain your changes.

The layout of audio artifact component was broken so I fixed it.

[codecov]

Codecov Report

Merging #697 (fba9cf1) into main (462f609) will not change coverage.
Report is 11 commits behind head on main.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #697   +/-   ##
=======================================
  Coverage   62.88%   62.88%           
=======================================
  Files          35       35           
  Lines        2250     2250           
=======================================
  Hits         1415     1415           
  Misses        835      835           

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[c-bata]

Thank you for your pull request. I've noticed that there is a similar issue when uploading .zip files, but it should be handled in the following PR. LGTM!