Remove incorrect resolution scaling code

[yohjimane]

The code incorrectly takes a smaller subregion and scales it up, rather than updating the internal resolution and scaling it up.

[Xottab-DUTY]

Thanks! That was incorrect code indeed! It should be used differently, according to this article: https://learn.microsoft.com/en-us/windows/uwp/gaming/multisampling--scaling--and-overlay-swap-chains