journal_block_server: only disable addrefs for journaled TLFs
journal_block_server: only disable addrefs for journaled TLFs

Issue: KBFS-1571

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