fix #774
We no longer need to update the recordings list from a room when the user is not logged in.
If the user is not logged in then we only select the data from the local database, we no longer synch with lb.
The error occured because the recordings needed an auth in order to work.
Don't fetch recordings for anonymous users in spaces/recordings, refs #774

Complements 573a47199, that did the same in the view `webconferences/show.html.erb`
but didn't modify the view that shows the full list of recordings at
`spaces/recordings.html.erb` (modified in this commit).