[windows] Aero + fake fullscreen + adjust refresh rate: display popup on possible video playback stutter

Not for Eden. :)

This PR is a small usability addition. Combining fake fullscreen and adjust refresh rate is known to cause video playback stutter with Aero enabled and the only reliable solution at hand is to use true fullscreen mode.

The PR adds a popup about the issue and offers the user to change the conflicting option comfortably. The combination of aero and adjust refresh rate stutter is a common reappearing problem in the Windows forum section.