Fix local time test case for logged-out viewers using global settings

Summary:
In D16936, I changed logged-out viewers so they use global settings.

This can lead to a SELECT from an isolated unit test. Instead, give the test fixtures and use standard generateNewUser() stuff.

Test Plan: Ran arc unit --everything.

Reviewers: chad

Reviewed By: chad

Differential Revision: https://secure.phabricator.com/D16952