Include sidebars in chatListData on native

Summary: We need to include sidebars in chatListData used on native to include them in search results

Test Plan: Make sure web works like before, make sure on native sidebars are not displayed as top-level threads when not searching, make sure they are displayed when searching

Reviewers: ashoat, palys-swm

Reviewed By: ashoat

Subscribers: zrebcu411, Adrian, atul

Differential Revision: https://phabricator.ashoat.com/D572