Fix up spots where we still tried to treat `remote.channels.all` as a map.

In ae93188f0f4f36086622636ba9ae4810cbd1f8c9, `remote.channels.all` became a flat array of channels, instead of a map, in order to simplify some of the reasoning around how state changes propagate. However, I neglected to remove all Map-shaped calls referring to it.

This lead to some pretty interesting behaviour:

* The client could not track unread state, because reconciling local state against the remote state would find no remote state, then throw away local state entirely as a result.
* The client would not actually update when a new channel appeared.
* The client would not actually update when a channel disappeared.

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