fix(frontend): 絵文字関連のスタイルが崩れているのを修正

[kakkokari-gtyih]

What

変更のビフォーアフターは MisskeyIO#725 を参照のこと

Why

Fix #12965

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 37.50000% with 5 lines in your changes missing coverage. Please review.

Project coverage is 19.55%. Comparing base (0e4b6d1) to head (e952ae5).
Report is 3 commits behind head on develop.

Files with missing lines	Patch %	Lines
...ackages/frontend/src/components/MkNotification.vue	0.00%	2 Missing ⚠️
...kages/frontend/src/pages/custom-emojis-manager.vue	0.00%	2 Missing ⚠️
...ages/frontend/src/components/MkReactionTooltip.vue	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop   #14559   +/-   ##
========================================
  Coverage    19.54%   19.55%           
========================================
  Files          713      713           
  Lines       100312   100317    +5     
  Branches       997      997           
========================================
+ Hits         19610    19612    +2     
- Misses       80158    80161    +3     
  Partials       544      544           

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[syuilo]

🙏🏿