Ensure cookie erasure, despite logout page redirect
Ensure cookie erasure, despite logout page redirect

Summary: Changes intends to redirect the user back to the page they came from when they logged out. Initially, this was cutting the /logout endpoint short before it could erase the cookies from the user's machine. This diff fixes that.

Test Plan: It works locally.

Reviewers: kylec, mkedia

Reviewed By: mkedia

Subscribers: changesbot

Differential Revision: https://tails.corp.dropbox.com/D141956

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