JCBC-399: Do not notify ViewFuture listeners twice.

This changeset fixes a regression introduced in the latest
listener changes, which makes sure to not notify the listeners
twice on the ViewFuture (which is triggered only when
setIncludeDocs(true)).

Change-Id: I59d0b7442b3aac451bfdd277b7d24681423ae7d6
Reviewed-on: http://review.couchbase.org/32305
Reviewed-by: Michael Nitschinger <michael.nitschinger@couchbase.com>
Tested-by: Michael Nitschinger <michael.nitschinger@couchbase.com>