fix(frontend): コンポーネントのインポート忘れを修正

[kakkokari-gtyih]

What

書いてあるとおり

Why

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 1 line in your changes missing coverage. Please review.

Project coverage is 20.06%. Comparing base (d60c307) to head (d113bec).
Report is 2 commits behind head on develop.

Files with missing lines	Patch %	Lines
...ackages/frontend/src/pages/settings/mute-block.vue	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           develop   #15274       +/-   ##
============================================
- Coverage    40.22%   20.06%   -20.17%     
============================================
  Files         1564      729      -835     
  Lines       198080   104055    -94025     
  Branches      3844     1198     -2646     
============================================
- Hits         79682    20875    -58807     
+ Misses      117793    82628    -35165     
+ Partials       605      552       -53     

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