Remove unnecessary Celery options

I checked again, and Celery respects the scheduler and log levels configured in settings.

@hansegucker It turned out it was you who added the explicit log levels and scheduler classes to the docker entrypoint. Can you please check again why you deemed that necessary?

added part::packaging type::bug labels

@hansegucker It turned out it was you who added the explicit log levels and scheduler classes to the docker entrypoint. Can you please check again why you deemed that necessary?

I think that there wasn't any need – I probably just copied it from the documentation.

merged

mentioned in commit 3605ee54