Make "Quote" work properly in Pholio

Summary:
See https://discourse.phabricator-community.org/t/quote-comment-missing-on-mock-pages/4155. Pholio is currently missing a couple of configuration calls to make the "Quote" action work.

Moving to EditEngine is the "real" fix, but this fix is trivial and should make "Quote" work properly with no negative effects.

Test Plan: Viewed a mock, used "quote" to quote a comment.

Differential Revision: https://secure.phabricator.com/D21437