sync: a test exchanging until level, not one answer

delivered_messages_are_answered_with_changes_we_lack failed now and
then: after the answer, the node still lacked the peer's change.
Automerge's sync tells what each side has by a Bloom filter, whose
false positives take more rounds. The test now exchanges up to four
rounds more, each asking for what is still missing, until both are
level.

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