Correct ASSET_MANAGER_BEARER_TOKEN env var
Correct ASSET_MANAGER_BEARER_TOKEN env var

This was set to the wrong name:
https://github.com/alphagov/govuk-puppet/blob/master/modules/govuk/manifests/apps/publisher.pp#L141

Also removed lines about this file being replaced since it won't be
anymore soon.

alphagov/publisher,alphagov/publisher,alphagov/publisher