remove config and checkpoint dir from default spark config

[behrica]

fixes #356

[anthony-khong]

Hi Carsten @behrica, my apologies for the delayed reply. Anything I can do to help to make this work for you? Do you need me to deploy a new version to Clojars?

[behrica]

My change makes it work for me,
bu I don't know if there was any reason to have the default config in the first place.

[anthony-khong]

Hi Carsten, I just gave you a maintainer access to the repo. Please feel free to change it however you see fit 🙏