kbfs_ops: initialize syncing TLFs on startup
kbfs_ops: initialize syncing TLFs on startup

To make sure the user has the latest data ready and synced before they
look at the folder.

Issue: KBFS-3525

keybase/client,keybase/client,keybase/kbfs,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/kbfs,keybase/client,keybase/client,keybase/kbfs,keybase/client,keybase/kbfs,keybase/client