Fix sync protocol false-positive tests
Fix sync protocol false-positive tests

The hashes of the changes in these tests changed because they include
the assignment of a nonnegative integer to a key, and the default has
now changed to represent all integer values as signed rather than
unsigned (in order to allow multi-inserts to be used for sequences of
integers that contain a mixture of positive and negative values).

automerge/automerge,automerge/automerge