MFMチートシートが表示できない不具合を修正

[kozakura913]

What

MFMチートシートが何も表示されない不具合を修正する

Why

なんか壊れてた

Additional info (optional)

マージ事故かも？原因不明

Checklist

• コントリビューションガイドを読みました( Read the contribution guide)
• ローカル環境で動作しました(Test working in a local environment)
• (必要なら)CHANGELOG_YOJO.mdの更新((If needed) Update CHANGELOG_YOJO.md)
• (必要なら)テストの追加((If possible) Add tests)

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 39 lines in your changes missing coverage. Please review.

Project coverage is 19.86%. Comparing base (af6ad49) to head (8cb6e87).
Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
packages/frontend/src/pages/mfc-cheat-sheet.vue	0.00%	39 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #592   +/-   ##
========================================
  Coverage    19.86%   19.86%           
========================================
  Files          797      797           
  Lines       123092   123092           
  Branches      1041     1041           
========================================
  Hits         24457    24457           
  Misses       98030    98030           
  Partials       605      605           

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