Merge #13535: [qa] wallet_basic: Specify minimum required amount for listunspent

Summary:
fa103a5d5e [qa] wallet_basic: Specify minimum required amount for listunspent (MarcoFalke)

Pull request description:

A value less than that would fail the tests later on anyway:

```
File "./test/functional/wallet_basic.py", line 250, in run_test
    self.nodes[1].sendrawtransaction(signed_raw_tx['hex'])

test_framework.authproxy.JSONRPCException: bad-txns-in-belowout, value in (1.00) < value out (49.998) (code 16) (-26)

Tree-SHA512: 7e72ad02b5623bc078610da06c34721836822a920a4e85b12a1e0f339e3205cdc11d39763197770e649fb73376f922ff91a8f244b465195e50a6798658e04f80

Backport of Core PR13535

Test Plan:

test_ruunner.py wallet_basic

Reviewers: O1 Bitcoin ABC, #bitcoin_abc, deadalnix

Reviewed By: O1 Bitcoin ABC, #bitcoin_abc, deadalnix

Differential Revision: https://reviews.bitcoinabc.org/D6319