[Windows] ウィンドウタイトルと各種ボタンがタイトルバーの色と同じになる問題の修正

[4ster1sk]

• Fix: [Windows] ウィンドウタイトルと閉じるボタンが表示されない #587
• ダークモード時にタイトルバーの色がダークモードではない問題を修正しました

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 36.57%. Comparing base (bc44391) to head (229fc5e).
Report is 2 commits behind head on develop.

Files	Patch %	Lines
lib/main.dart	0.00%	8 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #589      +/-   ##
===========================================
- Coverage    36.61%   36.57%   -0.04%     
===========================================
  Files          257      257              
  Lines        13586    13595       +9     
===========================================
- Hits          4974     4973       -1     
- Misses        8612     8622      +10     

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