Remove erroneous vhost declaration for govuk::apps::private_frontend
Remove erroneous vhost declaration for govuk::apps::private_frontend

This was copied from frontend but we don't want private-frontend to pretend to
be www.

alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet