r_renderscale breaks god rays

[RennyC4]

crepuscular/god rays (r_sun_colour/r_sun_dir) breaks with r_renderscale being increased

[fhomolka]

To add a bit more info: https://youtu.be/dSDkQsdk_eU In the test with renderscale -0.5, you can see it's following my view correctly, but it's not applied to the screen correctly. Upscaling possibly tries to apply its effect outside of the screen

[fhomolka]

Came back to do a bit more research. r_renderscale is at odds with all post-processing shaders except ASCII, it seems. The reason it's not at odds with ASCII is because that shader specifically takes in the screen size.