fix(frontend): MkDateSeparatedListで月の違う同じ日はセパレータが出ないのを修正

[kakkokari-gtyih]

What

年・月・日すべてが同じかどうかを確かめるように

Why

Fix #909

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 13 lines in your changes missing coverage. Please review.

Project coverage is 19.72%. Comparing base (837a8e1) to head (42ae654).
Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
...es/frontend/src/components/MkDateSeparatedList.vue	0.00%	13 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #14545      +/-   ##
===========================================
+ Coverage    19.53%   19.72%   +0.18%     
===========================================
  Files          713      713              
  Lines       100287   100294       +7     
  Branches       997      995       -2     
===========================================
+ Hits         19591    19781     +190     
+ Misses       80152    79971     -181     
+ Partials       544      542       -2     

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[syuilo]

🙏🏿