macos/atuin - --disable-up-arrow option

[andybusuu]

FYI https://github.com/simonw/til/blob/main/macos/atuin.md

atuin now has a --disable-up-arrow option:

eval "$(atuin init zsh --disable-up-arrow)"

https://github.com/ellie/atuin/blob/main/docs/docs/config/key-binding.md