Make inclusive_end actually work.

The problem is that default value for inclusive_end if it's omitted is
true. And the code explicitly skipped all the form fields which values
evaluate to false in if statement. So I made it not to skip boolean
fields.

Change-Id: I75ea60f9cc061e0187f125d9f3a0f2526d46bf37
Reviewed-on: http://review.couchbase.org/34661
Tested-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>