message: test: Fix intermittent issue in wallet_send
diff: @@ -316,6 +316,7 @@ class WalletSendTest(BitcoinTestFramework):
  res = self.nodes[0].sendrawtransaction(hex)
  self.nodes[0].generate(1)
  assert_equal(self.nodes[0].gettransaction(txid)["confirmations"], 1)
  + self.sync_all()
  self.log.info("Lock unspents...")
  utxo1 = w0.listunspent()[0]
  