fix api/config.py override settings function to allow for auth environment variables

[olgn]

Review Checklist

• Tests were added to cover all code changes
• Documentation was added / updated
• Code and tests follow standards in CONTRIBUTING.md

[kofalt]

Hi @olgn, did you mean to open this against poldracklab/bids-core instead?

If not, it might be easier to get a smaller changeset merged. There looks to be a lot of source conflicts at the moment.

[gsfr]

@olgn @chrisfilo Is this repo really the intended destination?

[olgn]

@kofalt @gsfr yes, this was intended to be a pull request on poldracklab/bids-core. my mistake