libpayload/curses/{form,menu}: Fix uncountable "information"

Change-Id: I28c79d0262a54b58d353802e0d572e5b8be5fbc5
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/26595
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
6 files changed