Fix castellan-ui release job
Fix castellan-ui release job

Since castellan-ui is a horizon plugin, it
should use 'publish-to-pypi-horizon' instead
of 'publish-to-pypi' as one of its templates.

Change-Id: Id056da57d7d63e6a4ea88eca5c0559349f3d630e

openstack-infra/project-config,openstack-infra/project-config