feat: Improve condition of updating commands

[MikuroXina]

Closes #1343.

Type of Change:

機能の改善

Dealing with Problems (問題への対処)

登録済コマンドが更新されているかどうかの判定関数を, 少し丁寧に実装することで条件を厳しくした.

[codecov]

Codecov Report

Attention: Patch coverage is 84.21053% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 59.04%. Comparing base (9848f85) to head (58ad94c).

Files	Patch %	Lines
packages/bot/src/service/command/register.ts	84.21%	0 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1345      +/-   ##
==========================================
+ Coverage   58.96%   59.04%   +0.07%     
==========================================
  Files         112      112              
  Lines        7323     7337      +14     
  Branches      530      530              
==========================================
+ Hits         4318     4332      +14     
  Misses       2476     2476              
  Partials      529      529              

Flag	Coverage Δ
unittests	59.04% <84.21%> (+0.07%)	⬆️

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