Fix create room redirection (navigation, history)

Fix create room redirection (navigation, history)

Fix https://gitlab.com/gitlab-org/gitter/webapp/issues/2161

Update: This was follow-up on in https://gitlab.com/gitlab-org/gitter/webapp/merge_requests/1441

Testing strategy

1. Add the feature toggle, node ./scripts/utils/feature-toggle.js --name vue-left-menu --description "Left menu using Vue (alpha)"
2. Enable the feature toggle
   • Enable: http://localhost:5000/api_web/features/vue-left-menu/1
   • Disable: http://localhost:5000/api_web/features/vue-left-menu/0

Try the following with and without the feature toggle:

1. Create a room and notice you are redirected to that new room. If the realtime is fast enough and the new room is in your troupeCollection, it may even switch without a page reload.

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Closes #2161 (closed)