MB-7978 Remove list reversal

Missed in commit 912b8667560a275a652a2ff0d9d9264ed38e9328.
Just a mirror of couch_set_view_mapreduce.erl until
development views, single partition, use set views.

Change-Id: Ic657dde47c08f413efe291cf59674960fc5ade61
Reviewed-on: http://review.couchbase.org/25397
Reviewed-by: Filipe David Borba Manana <fdmanana@gmail.com>
Tested-by: Filipe David Borba Manana <fdmanana@gmail.com>