Change author to email in sheriff-o-matic.

This value was supposed to be the email, but this broke with the
git migration since the git-only version actually only has the username
in the author field, not the whole email address.

NOTRY=true

Review URL: https://codereview.chromium.org/586363002

git-svn-id: svn://svn.chromium.org/blink/trunk@182447 bbb929c8-8fbe-4397-9dbb-9b2b20218538