CBD-1354: fix typo in dashboard method for windows builds on jenkins

Change-Id: I0a75c9b806694740f0c75d1400c2918f535dc124
Reviewed-on: http://review.couchbase.org/36150
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>