cat-file: split ordered/unordered batch-all-objects callbacks

When we originally added --batch-all-objects, it stuffed everything into
an oid_array(), and then iterated over that array with a callback to
write the actual output.

When we later added --unordered, that code path writes immediately as we
discover each object, but just calls the same batch_object_cb() as our
entry point to the writing code. That callback has a narrow interface;
it only receives the oid, but we know much more about each object in the
unordered write (which we'll make use of in the next patch). So let's
just call batch_object_write() directly. The callback wasn't saving us
much effort.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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