Merge #15664: change default Python block serialization to witness

124ea38e39 change default Python block serialization to witness (Gregory Sanders)

Pull request description:

ACKs for commit 124ea3:
  stevenroose:
    ACK 124ea38e39

Tree-SHA512: 52877934f8a3c761cb89a618daffe73e86b008d9d32d48721392b7626aaa10d3b9aa26e4c59337729e0a2d01fc48648eef5ec3d72de531a685a2cf4f4d7579ab

test/functional/test_framework/messages.py

@@ -605,7 +605,7 @@ class CBlock(CBlockHeader):
         super(CBlock, self).deserialize(f)
         self.vtx = deser_vector(f, CTransaction)
 
-    def serialize(self, with_witness=False):
+    def serialize(self, with_witness=True):
         r = b""
         r += super(CBlock, self).serialize()
         if with_witness: