R1:dc9aaa0fc2bf

Fix a stray "%Q" warning when hiding/showing inline comments

Summary: See PHI1095.

Test Plan: Viewed a revision, toggled hide/show on inline comments. Before: warning in logs; after: smooth sailing.

Reviewers: amckinley

Reviewed By: amckinley

Differential Revision: https://secure.phabricator.com/D20212