fix(backend): embedの動作に必要な値を復活させる

[kakkokari-gtyih]

What

Why

frontend-shared/js/config.ts にはHTML要素を参照する実装があるが、embed htmlで一部要素が提供されておらず、表示がおかしくなることがあるため

Additional info (optional)

Checklist

• [ ] Read the contribution guide
• [ ] Test working in a local environment
• [ ] (If needed) Add story of storybook
• [ ] (If needed) Update CHANGELOG.md
• [ ] (If possible) Add tests

[codecov[bot]]

Codecov Report

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

Project coverage is 39.58%. Comparing base (5c94b4c) to head (6a3f85e). Report is 5 commits behind head on develop.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #14633 +/- ## =========================================== - Coverage 39.61% 39.58% -0.04% =========================================== Files 1542 1542 Lines 192808 192800 -8 Branches 3538 2524 -1014 =========================================== - Hits 76381 76319 -62 - Misses 115831 115916 +85 + Partials 596 565 -31 ```

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[github-actions[bot]]

このPRによるapi.jsonの差分 差分はありません。 Get diff files from Workflow Page

[syuilo]

🙏🏻