Replace dependency on console-terminus with console-setup + console-setup-linux

console-terminus is purely virtual.

Inside console-setup-linux's udev rule there's a rule
depending on /etc/console-setup/cached_setup_font.sh which
itself is provided only via console-setup, otherwise it
fails with:

| systemd-udev: failed to execute '/etc/console-setup/cached_setup_font.sh' '/etc/console-setup/cache_setup_font.sh': No such file or directory

Closes grml/grml#8