ui/ncurses: ked -> boot-editor

git mv ui/ncurses/nc-ked.c ui/ncurses/nc-boot-editor.c
git mv ui/ncurses/nc-ked.h ui/ncurses/nc-boot-editor.h
find ui/ncurses -type f |
	xargs sed -i -e s/nc-ked\./nc-boot-editor./g \
	             -e s/ked/boot_editor/g

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>