We were not actually using anything but the IDs here, so it was a
bunch of wasted work to fetch these.
This essentially reverts f48e87cd3c. At
the time, something like that was required, because we needed to check
if the channel was deactivated before exposing it to the API, but more
recent reworking of the system to change the setting if the channel is
deactivated, rather than masking it in fetch_initial_state_data, means
we can do this cleanup.
0338fd7357