In 71eae25, TRAMP settings were moved to a new :emacs tramp module,
reverting `tramp-backup-directory-alist` and `tramp-auto-save-directory`
to their Emacs defaults for anyone not using this module (which saves
those temp files in the current working directory, which is an
undesirable default), so we set them in core again.
Fix: doomemacs/community#53
Amend: 71eae252ac