Snippet: edits to wallet_basic.py to accommodate new, lower maxfeerate default

wallet_basic.py

        # check if we can list zero value tx as available coins
        # 1. create raw_tx
        # 2. hex-changed one output to 0.0
        # 3. sign and send
        # 4. check if recipient (node0) can list the zero value tx
        usp = self.nodes[1].listunspent(query_options={'minimumAmount': '49.998'})[0]
        inputs = [{"txid": usp['txid'], "vout": usp['vout']}]
        test_amount = Decimal("0.00001000")  # this output amount will be zeroed and thereby added to the fee
        fee = Decimal("0.00000400")  # start with a modest fee so our final fee won't exceed default maxfeerate
        outputs = {self.nodes[1].getnewaddress(): usp['amount'] - test_amount - fee, self.nodes[0].getnewaddress(): test_amount}

        raw_tx = self.nodes[1].createrawtransaction(inputs, outputs).replace("e8030000", "00000000")  # replace test_amount with 0.0 (int32)
        signed_raw_tx = self.nodes[1].signrawtransactionwithwallet(raw_tx)
        decoded_raw_tx = self.nodes[1].decoderawtransaction(signed_raw_tx['hex'])
        zero_value_txid = decoded_raw_tx['txid']
        self.nodes[1].sendrawtransaction(hexstring=signed_raw_tx['hex'])