neofetch: Print MACHINE_ARCH not MACHINE for FreeBSD

[jrtc27]

MACHINE refers to the architecture family, whereas MACHINE_ARCH refers to the specific variant. For x86, MACHINE is already split up into i386 and amd64, so there is only one MACHINE_ARCH for each, that takes an identical value, and thus this patch has no effect there. There is also the oddity of arm64, which only has one MACHINE_ARCH, but the name of that is aarch64. For other architectures, one MACHINE covers multiple MACHINE_ARCH variants, like powerpc which has powerpc, powerpcspe, powerpc64 and powerpc64le. It's therefore more helpful to print MACHINE_ARCH here, not MACHINE.

Note that MACHINE_ARCH is what official release information, such as download pages and the list of supported architectures, tends to use, due to its increased specificity.

This may also apply to other BSDs, but I have no experience of them.

[hykilpikonna]

Maybe a better way of writing it would be to test for [[ $kernel_name == FreeBSD ]] && machine_arch=$(uname -p) after the case block, but this is fine

[hykilpikonna]

Thank you for your contribution!

This PR is merged into hyfetch since this repo (dylanaraps/neofetch) seems no longer maintained.

HyFetch is a fork of neofetch with LGBTQ pride flags, but the repo also maintains an updated version of the original neofetch, addressing many pull requests that are not merged in the original repo.

Read the "Running Updated Original Neofetch" section for more info!