[fix #59] Remove use of `setcdr` because it's mutate-y
[fix #59] Remove use of `setcdr` because it's mutate-y

Replaced this with a lexical setq and add the car as the first
argument to append

domtronn/all-the-icons.el,domtronn/all-the-icons.el,domtronn/all-the-icons.el,domtronn/all-the-icons.el,domtronn/all-the-icons.el