Conpherence - don't lose title glyph when switching between messages

Summary: Fixes T7735

Test Plan: switched threads in main conpherence view and observed working title glyph.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T7735

Differential Revision: https://secure.phabricator.com/D12305