t5704: send object-format capability with SHA-256

When we speak protocol v2 in this test, we must pass the object-format
header if the algorithm is not SHA-1.  Otherwise, git upload-pack fails
because the hash algorithm doesn't match and not because we've failed to
speak the protocol correctly.  Pass the header so that our assertions
test what we're really interested in.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t5704-protocol-violations.sh

@@ -9,6 +9,7 @@ making sure that we do not segfault or otherwise behave badly.'
 test_expect_success 'extra delim packet in v2 ls-refs args' '
 	{
 		packetize command=ls-refs &&
+		packetize "object-format=$(test_oid algo)" &&
 		printf 0001 &&
 		# protocol expects 0000 flush here
 		printf 0001
@@ -21,6 +22,7 @@ test_expect_success 'extra delim packet in v2 ls-refs args' '
 test_expect_success 'extra delim packet in v2 fetch args' '
 	{
 		packetize command=fetch &&
+		packetize "object-format=$(test_oid algo)" &&
 		printf 0001 &&
 		# protocol expects 0000 flush here
 		printf 0001