fix(frontend): サーバードキュメントとMisskey関連リソースとの間にdividerが入らないことがある問題を修正

[kakkokari-gtyih]

What

ここが抜けていたのを修正（多分条件が間違っていた）

Why

Additional info (optional)

Checklist

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

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 19.33%. Comparing base (d91a1be) to head (421fb99). Report is 5 commits behind head on develop.

Files with missing lines	Patch %	Lines
packages/frontend/src/ui/_common_/common.ts	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #15044 +/- ## =========================================== + Coverage 19.14% 19.33% +0.18% =========================================== Files 728 728 Lines 103800 103800 Branches 993 991 -2 =========================================== + Hits 19876 20066 +190 + Misses 83368 83180 -188 + Partials 556 554 -2 ```

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[syuilo]

🙏🏻