fix(frontend): server metrics look strange after reload

[zyoshoka]

What

サーバーメトリクスが2つ以上あるとリロード直後の表示がおかしくなる問題を修正します。

Why

Closes #14463

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]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 20.02%. Comparing base (44f6216) to head (913c23b).
Report is 7 commits behind head on develop.

Files with missing lines	Patch %	Lines
...ges/frontend/src/widgets/server-metric/cpu-mem.vue	0.00%	1 Missing ⚠️
...ackages/frontend/src/widgets/server-metric/net.vue	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #14467      +/-   ##
===========================================
- Coverage    20.21%   20.02%   -0.19%     
===========================================
  Files          725      725              
  Lines       100550   100550              
  Branches      1050     1052       +2     
===========================================
- Hits         20327    20137     -190     
- Misses       79681    79869     +188     
- Partials       542      544       +2     

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[KisaragiEffective]

ありがとうございます 🙏🏻
メモ: MDN

[syuilo]

🙏🏿