fix: compositor will always be bypassed on fullscreen apps

[Jaskowicz1]

This PR fixes an issue where the compositor was not being bypassed if is_window_rect_full_virtual_screen() returned false, which seemingly did this on some machines (See https://github.com/ValveSoftware/Proton/issues/4469).

This isn't the most clean fix, and SHOULD be temporary until is_window_rect_full_virtual_screen is fixed to work across all machines. However, I cannot build Proton (See https://github.com/ValveSoftware/Proton/issues/8012) to fix it myself, but this issue is driving me insane so this is the fix.