Updated terminal faces to work with newer emacs version
Updated terminal faces to work with newer emacs version

If no background color is defined, the face will use the default
background color, this results incorrect colors in many terminal programs.

greduan/emacs-theme-gruvbox,zzgraph/emacs-theme-gruvbox,zzgraph/emacs-theme-gruvbox,greduan/emacs-theme-gruvbox,greduan/emacs-theme-gruvbox,zzgraph/emacs-theme-gruvbox