Summary:
- Was not properly updating the references to snoozed categories when
accounts were added or removed
- Update whenCategoriesReady to make sure we listen until category syncing has concluded (Move inside CategoryStore)
- #1676, #1658
Test Plan: - TODO
Reviewers: evan, drew, bengotow
Reviewed By: bengotow
Differential Revision: https://phab.nylas.com/D2723