Logging out while looking at a message returns you to the Root sheet
Logging out while looking at a message returns you to the Root sheet

Summary:
If you open a message and logout, and log-in to a new account, upon successfu
         login you see a blank page instead of the thread list view. This makes the default
         edgehill state to return to the root sheet video upon logout

Test Plan: none

Reviewers: bengotow, evan

Reviewed By: evan

Subscribers: evan

Differential Revision: https://review.inboxapp.com/D1346

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