hid: roccat-kone: fix off-by-one bug in attributes

Stefan pointed out that I messed up the array for the binary attributes,
so fix it properly.

Reported-by: Stefan Achatz <erazor_de@users.sourceforge.net>
Cc: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>