configs/: remove "Copy to RAM" boot entries since it's automatic now

The default is now copytoram=auto which enables copying to RAM when free RAM exceeds the rootfs image size + 2 GiB.

See mkinitcpio/mkinitcpio-archiso#13 and mkinitcpio/mkinitcpio-archiso!26.

Implements #177.
6 jobs for !263 with rm-copytoram in 22 seconds (queued for 1 second)
latest merge request