Make the window edges dark when Windows is in dark mode

[Xenius97]

Is your feature request related to a problem? Please describe.

Currently if you run MTA in windowed mode, window edge is white

Describe the solution you'd like

Detect system mode and use dark edges line other programs

Security Policy

• I have read and understood the Security Policy and this issue is not about a cheat or security vulnerability.

[botder]

Just set DWMWA_USE_IMMERSIVE_DARK_MODE to TRUE via DwmSetWindowAttribute from dwmapi.dll.
https://github.com/libsdl-org/SDL/blob/f8468d580d903e106640800034a4721aca24264c/src/video/windows/SDL_windowswindow.c#L2227-L2239