R1:e5b97cd17c36

Fix typeahead browse dialog paging

Summary: This accidentally got disabled; we need to pull one more result that we'll use to tell if there's a next page.

Test Plan: Saw "more results" again.

Reviewers: btrahan, chad

Reviewed By: chad

Subscribers: epriestley

Differential Revision: https://secure.phabricator.com/D12461