tests/payments: fix redeem fixture mutation
tests/payments: fix redeem fixture mutation

BitGo/bitcoinjs-lib,visvirial/bitcoinjs-lib,bitcoinjs/bitcoinjs-lib,bitcoinjs/bitcoinjs-lib,visvirial/bitcoinjs-lib,junderw/bitcoinjs-lib,UdjinM6/bitcoinjs-lib-dash,BitGo/bitcoinjs-lib,junderw/bitcoinjs-lib