fix(windows): use registry value to detect dark mode

[Slinetrac]

• Tested on all platforms changed
• Added an entry to the changelog module if knowledge of this change could be valuable to users
• Updated documentation to reflect any user-facing changes, including notes of platform-specific behavior
• Created or updated an example program if it would help users understand this functionality

Fix #4161.

See details in tauri-apps/tao#1165.