Remove deprecated Arch Linux package

The `scrcpy-prebuiltserver` has been deprecated in favor of the `scrcpy`
package.

<https://aur.archlinux.org/cgit/aur.git/commit/?h=scrcpy-prebuiltserver&id=2ef4359b2e45fc278a191fae014d381b486ffcfe>

Signed-off-by: Romain Vimont <rom@rom1v.com>