Fix papersprites being rotated incorrectly in Software when viewing them on the flipped side

As described in the title. Makes the behavior identical to OpenGL. Currently when I need to rotate papersprites, I have to use a horrible hack where I get the renderer in a HUD hook, smuggle it to the main script, and use a new variable to track the actual rollangle, and invert it if it's Software & it's being viewed from a certain side.