Use fileicon for golang icon
Use fileicon for golang icon

Fix https://github.com/domtronn/all-the-icons.el/issues/170 again
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