cubicweb-brainomics #3316348 Remove download while register logic, used only for BrainomicsLocalizer [resolved]

There is a part of the code that limit the downloading of data to register users only. This behavior may be configured in the all-in-one but should be removed anyway and be implemented through permissions.

prioritynormal
typebug
done in0.5.0
load1.000
load left0.000
closed by<not specified>