Mark contacts as using the default buildProject script
Mark contacts as using the default buildProject script

We changed the contacts-admin to use the default buildProject jenkins
script (see [contacts-admin#280](https://github.com/alphagov/contacts-admin/pull/280)
and so our jenkins job no longer needs to explicitly wait on it before
reporting back to github.

alphagov/govuk-content-schemas,alphagov/govuk-content-schemas