Fix missing setQuoteRef() on Commit detail pages in Diffusion

Summary: Fixes T12253.

Test Plan:

• Before change: used "Quote Comment", saw "In null, alice wrote:" in quoted text.
• After change: used "Quote Comment", saw proper reference to the commit/page. Clicked reference, was sent to the comment properly.

{F2859093}

Reviewers: chad, avivey

Reviewed By: avivey

Maniphest Tasks: T12253

Differential Revision: https://secure.phabricator.com/D17343