pillowfight: fix ratio parameter

This was previously being not handled correctly

Change-Id: I6eba73519470974d5fe18cadd2dbb9fc51fe8cae
Reviewed-on: http://review.couchbase.org/40310
Tested-by: Mark Nunberg <mnunberg@haskalah.org>
Reviewed-by: Brett Lawson <brett19@gmail.com>