Local correlation fields not logged

Describe the Bug

Hello, as I understand and as explained in Micrometer Tracing, correlation fields should be logged in the tracing context (i.e SFL4J MDC).

The issue is that using brave implementation requires them to be defined as remote fields in order to be logged in the MDC.

Steps to Reproduce

Clone this project
Checkout issues/brave branch
Start the app and call the server as explained in the README

You will see that only the standard traceId and spanId baggages are logged. If you edit the application.yaml file and uncomment the following configuration:

      remote-fields:
        - myBaggageFilter
        - myBaggageController

The custom baggages myBaggageFilterand myBaggageController are now correctly logged.

Expected Behaviour

The custom baggages myBaggageFilterand myBaggageController should be logged without being declared as remote fields.

Thanks for the help.

openzipkin / brave