CBLT-319:  fix typo in ios builder name

Change-Id: I87c645de166f0c78f0d5aa9a4af1ca558b1a06cf
Reviewed-on: http://review.couchbase.org/39103
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>