CBLT-333:  fix typo in options for set_jenkins_default_param.pl

Change-Id: I8ce6858b39ee10e205af9bd63de450bc055f11bf
Reviewed-on: http://review.couchbase.org/41618
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>