postpone x_pubkeys replacement (fix #2738)

lib/transaction.py

@@ -566,7 +566,7 @@ class Transaction:
                         j = pubkeys.index(pubkey)
                         print_error("adding sig", i, j, pubkey, sig)
                         self._inputs[i]['signatures'][j] = sig
-                        self._inputs[i]['x_pubkeys'][j] = pubkey
+                        #self._inputs[i]['x_pubkeys'][j] = pubkey
                         break
         # redo raw
         self.raw = self.serialize()
@@ -831,7 +831,7 @@ class Transaction:
                     sig = private_key.sign_digest_deterministic(pre_hash, hashfunc=hashlib.sha256, sigencode = ecdsa.util.sigencode_der)
                     assert public_key.verify_digest(sig, pre_hash, sigdecode = ecdsa.util.sigdecode_der)
                     txin['signatures'][j] = bh2u(sig) + '01'
-                    txin['x_pubkeys'][j] = pubkey
+                    #txin['x_pubkeys'][j] = pubkey
                     txin['pubkeys'][j] = pubkey # needed for fd keys
                     self._inputs[i] = txin
         print_error("is_complete", self.is_complete())