Remove file resource for default config
Remove file resource for default config

This file should be created and handled by the upstream module, and all
the configuration is populated using the `$config_hash` parameter which
is detailed in a73c0acccb2558505bf0db483927d7f48ac5ad85. The file
resource becomes redundant.

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