menu: Re-enable the ANSI codes

The intent here was to allow ANSI codes to be disabled, since it was
proving impoosible to test operation of the menu code when it kept moving
the cursor. Unfortunately this ended up in the patch.

Correct this by enabling ANSI again.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reported-by: Pali Rohár <pali@kernel.org>
Reported-by: Mark Kettenis <mark.kettenis@xs4all.nl>
Reported-by: Frank Wunderlich <frank-w@public-files.de>
Fixes: 32bab0ea ("menu: Make use of CLI character processing")
Tested-by: Mark Kettenis <kettenis@openbsd.org>
Reviewed-by: Mark Kettenis <kettenis@openbsd.org>