Add test for witness = true edge case during multisigning
Add test for witness = true edge case during multisigning

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