Bulk Export Content-Location does not respect fixed base URL

[samguntersmilecdr]

NOTE: Before filing a ticket, please see the following URL:
https://github.com/hapifhir/hapi-fhir/wiki/Getting-Help

Describe the bug
The Content-Location header of the bulk export response does not respect a fixed base URL, instead using the default base url.

To Reproduce
Steps to reproduce the behavior:

1. Configure module.fhir_endpoint.config.base_url.fixed = https://apis.example.org/fhirBaseUrl
2. Trigger a bulk export
3. Inspect Content-Location header value

Content-Location value does NOT have the base_url.fixed value

Expected behavior
Content-Location value has a base url value equal to the {{base_url.fixed}} value

[samguntersmilecdr]

This will reverse the changes that were made in #3956