Update display.rs

[rodraah]

Detect current monitor first, to make it work with multimonitors

[nishantg96]

I tested this and works. It should be merged into the main branch since it is quite useful for someone who uses a window manager.

[SparK-Cruz]

It might be the case we build it from rodraah's repo and notify distros' package maintainers to point there instead. It should be as easy as editing the url in a config file for Arch's AUR tho...

EDIT: Not that I think rodraah is active either...