[aur-general] Delete proposal: asus-screen-brightness

[Jerome Leclanche]

https://aur.archlinux.org/packages/asus-screen-brightness/

- The entirety code is stored in the source package
- It's just a bash file and a system service file (which is not useful)
- xorg-xbacklight provides the same functionality without requiring root.

That said it's referenced in the wiki as an alternative to
xorg-xbacklight which I... don't quite get.

J. Leclanche