MB-8602: Cleanup function call

The capi_view:finalize_view_merge_params/5 actually only
needs 2 arguments.

Change-Id: Ia763aa42eff007bbc0276f8c5c965028bc6df8ed
Reviewed-on: http://review.couchbase.org/27418
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>