Remove unreferenced govuk::apps::whitehall_admin
Remove unreferenced govuk::apps::whitehall_admin

This class was removed in 87dec94 of PR #217.

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