[native] fix missing threadInfo in thread settings

Summary:
Logging out while sidebar settings are opened causes a crash.
https://linear.app/comm/issue/ENG-1721/

After logging out, we lose redux state and crash because threadInfo is undefined. In this case we should fall back onto threadInfo in the navigation params.

Test Plan:

1. Check if the app doesn't crash after logging out with sidebar settings open.
2. Check if the app doesn't crash with non-sidebar thread settings open.
3. Check that if you change some value in settings (e.g. color) and log out, the settings screen that "blinks" for a moment has an updated value.

Reviewers: tomek, atul, abosh, ashoat

Reviewed By: ashoat

Subscribers: ashoat

Differential Revision: https://phab.comm.dev/D5142