[lib] Replace loggedIn check with canQuery in BaseAutoJoinCommunityHandler

Summary:
This diff is a no-op, as canQuery is set to loggedIn above. I'm simplifying the code ahead of the next diff.

Depends on D13626

Test Plan: Flow

Reviewers: varun

Reviewed By: varun

Subscribers: tomek

Differential Revision: https://phab.comm.dev/D13627