Scope commits page on people to just your commits

Summary: This is overly broad and I missed it in local testing with just a single account. Let's pull just the author in.

Test Plan: Review a commit page that wasn't my own, see other authors commits.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Differential Revision: https://secure.phabricator.com/D17481