scripted-diff: test: rename CTransaction .getwtxid() -> wtxid_hex for consistency

-BEGIN VERIFY SCRIPT-

sed -i "s|def getwtxid|@property\n    def wtxid_hex|g" ./test/functional/test_framework/messages.py
sed -i "s|getwtxid()|wtxid_hex|g" $(git grep -l getwtxid)

-END VERIFY SCRIPT-

test/functional/p2p_permissions.py

@@ -118,7 +118,7 @@ class P2PPermissionsTests(BitcoinTestFramework):
 
         self.log.debug("Check that node[1] will send the tx to node[0] even though it is already in the mempool")
         self.connect_nodes(1, 0)
-        with self.nodes[1].assert_debug_log(["Force relaying tx {} (wtxid={}) from peer=0".format(txid, tx.getwtxid())]):
+        with self.nodes[1].assert_debug_log(["Force relaying tx {} (wtxid={}) from peer=0".format(txid, tx.wtxid_hex)]):
             p2p_rebroadcast_wallet.send_txs_and_test([tx], self.nodes[1])
             self.wait_until(lambda: txid in self.nodes[0].getrawmempool())
 
@@ -134,14 +134,14 @@ class P2PPermissionsTests(BitcoinTestFramework):
             [tx],
             self.nodes[1],
             success=False,
-            reject_reason='{} (wtxid={}) from peer=0 was not accepted: dust'.format(txid, tx.getwtxid())
+            reject_reason='{} (wtxid={}) from peer=0 was not accepted: dust'.format(txid, tx.wtxid_hex)
         )
 
         p2p_rebroadcast_wallet.send_txs_and_test(
             [tx],
             self.nodes[1],
             success=False,
-            reject_reason='Not relaying non-mempool transaction {} (wtxid={}) from forcerelay peer=0'.format(txid, tx.getwtxid())
+            reject_reason='Not relaying non-mempool transaction {} (wtxid={}) from forcerelay peer=0'.format(txid, tx.wtxid_hex)
         )
 
     def checkpermission(self, args, expectedPermissions):