MB-11060:  pass 6th param to server-win.rb

Change-Id: Idea36d2a8d337b6f0a1de5ddd0fda477e5a93132
Reviewed-on: http://review.couchbase.org/41653
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>