Fix "Thread message feed not showing when user isn't room member"
Closes #2343 (closed)
When the user wasn't a member of a room the initial roomMap in the state missed the current room because the Map was only populated by the restful.serializeTroupesForUser(userId).
The displayedRoom getter is used in our Vue code to generate permalinks for messages.
Note: Hiding the thread message input box is going to be implemented in https://gitlab.com/gitlab-org/gitter/webapp/issues/2206
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Testing strategy:
- Visit a room with threaded messages that you are not a member of
- Open a message thread
- Observe thread messages being present