application: Fix content download dialog
application: Fix content download dialog

Domain.get_subscription_entries no longer exists, we
forgot to update this call to the new ekncontent API.

https://phabricator.endlessm.com/T18050

endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib