[native] Fix wrong title during thread creation

Summary:
ENG-1875
If you start creating a new chat and don't add any people the title will display your name and clicking it will navigate you to your private chat's settings. This happens because Ashoat is added to every chat be default and the isSearchEmpty is always false.

Test Plan: Start creating a new chat and don't select any other users, title should be "New Message". Also, test as Ashoat.

Reviewers: tomek, atul, abosh, ashoat

Reviewed By: ashoat

Subscribers: varun, ashoat

Differential Revision: https://phab.comm.dev/D5218