Remove redundant calculators_frontend class Carrenza hieradata
Remove redundant calculators_frontend class Carrenza hieradata

This class is no longer used in Carrenza, all the apps on it have been
migrated to AWS.

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