[lib] [refactor] [ENG-530] add memo in inline sidebar hook
Summary: updating the hook per my comment in my last diff: https://phabricator.ashoat.com/D3879#inline-23803
Test Plan: use the application like normal. replied should reflect in a sidebar as they do normally.
Reviewers: atul, def-au1t, yayabosh, ashoat
Reviewed By: ashoat
Subscribers: palys-swm, Adrian, karol-bisztyga
Differential Revision: https://phabricator.ashoat.com/D3887