Fix immediate redirect to login screen on Chrome initial load

Summary: Use store.getToken() not getTokens() in App.oauth to ensure we exclude expired tokens

Test Plan:
- Load UI on chrome, see that you are not redirected
- Log in (see this still works)
- Close window
- Open new window with UI. See that you are still logged in (as token is still valid)
- Log out
- Reload UI homepage. See that you are still logged out, and not redirected

Reviewers: shadowhand, eyedol

Reviewed By: eyedol

Maniphest Tasks: T148

Differential Revision: https://phabricator.ushahidi.com/D23