[web] Update LoginForm useEffect early-exit logic to include notificationIdentityPublicKeys

Summary:
Instead of just considering the primaryIdentityPublicKey, we check wither the primaryIdentityPublicKeys and notificationIdentityPublicKeys objects are set (eg not null or undefined).

Depends on D6878

Test Plan: Logged values, things were as expected.

Reviewers: ashoat, tomek, marcin

Reviewed By: ashoat

Differential Revision: https://phab.comm.dev/D6879