el/dot-emacs.el: More assertive zapping of faces.

el/dot-emacs.el: More assertive zapping of faces.

If someone fiddles with a face using `set-face-attribute' or similar,
then things seem to work in the initial frame but then look wrong in
frames opened later.

There isn't an obvious way to reset a face to its initial bare state.
So do it the not-obvious way: make a face which is guaranteed to be in
its initial, unsullied state and copy that over the top of the target
face.