test: Make the scriptPubKey of MiniWallet created txs mutable
test: Make the scriptPubKey of MiniWallet created txs mutable

This makes individual bytes of the scriptPubKey mutable, previously it
could only be re-assigned as a whole.

AkioNak/bitcoin,namecoin/namecoin-core,sipsorcery/bitcoin,bitcoin/bitcoin,namecoin/namecore,kallewoof/bitcoin,fujicoin/fujicoin,fujicoin/fujicoin,sstone/bitcoin,sipsorcery/bitcoin,namecoin/namecoin-core,namecoin/namecore,fanquake/bitcoin,particl/particl-core,lateminer/bitcoin,bitcoin/bitcoin,tecnovert/particl-core,fujicoin/fujicoin,kallewoof/bitcoin,fanquake/bitcoin,sstone/bitcoin,mruddy/bitcoin,sstone/bitcoin,bitcoinsSG/bitcoin,particl/particl-core,sstone/bitcoin,instagibbs/bitcoin,Xekyo/bitcoin,namecoin/namecoin-core,namecoin/namecoin-core,AkioNak/bitcoin,sipsorcery/bitcoin,jamesob/bitcoin,fujicoin/fujicoin,bitcoinsSG/bitcoin,bitcoinsSG/bitcoin,instagibbs/bitcoin,mruddy/bitcoin,ajtowns/bitcoin,kallewoof/bitcoin,tecnovert/particl-core,particl/particl-core,ajtowns/bitcoin,bitcoin/bitcoin,lateminer/bitcoin,bitcoin/bitcoin,lateminer/bitcoin,domob1812/bitcoin,instagibbs/bitcoin,particl/particl-core,jamesob/bitcoin,namecoin/namecore,domob1812/bitcoin,fujicoin/fujicoin,mruddy/bitcoin,lateminer/bitcoin,ajtowns/bitcoin,tecnovert/particl-core,ajtowns/bitcoin,lateminer/bitcoin,domob1812/bitcoin,bitcoin/bitcoin,AkioNak/bitcoin,jamesob/bitcoin,particl/particl-core,instagibbs/bitcoin,kallewoof/bitcoin,instagibbs/bitcoin,fanquake/bitcoin,sstone/bitcoin,jambolo/bitcoin,AkioNak/bitcoin,namecoin/namecoin-core,namecoin/namecore,fanquake/bitcoin,kallewoof/bitcoin,Xekyo/bitcoin,jambolo/bitcoin,jambolo/bitcoin,domob1812/bitcoin,jambolo/bitcoin,jambolo/bitcoin,kallewoof/bitcoin,Xekyo/bitcoin,jambolo/bitcoin,fujicoin/fujicoin,AkioNak/bitcoin,namecoin/namecoin-core,instagibbs/bitcoin,jamesob/bitcoin,fanquake/bitcoin,sipsorcery/bitcoin,tecnovert/particl-core,mruddy/bitcoin,Xekyo/bitcoin,ajtowns/bitcoin,bitcoinsSG/bitcoin,Xekyo/bitcoin,domob1812/bitcoin,bitcoin/bitcoin,sipsorcery/bitcoin,tecnovert/particl-core,jamesob/bitcoin,sstone/bitcoin,tecnovert/particl-core,bitcoinsSG/bitcoin,mruddy/bitcoin,jamesob/bitcoin,domob1812/bitcoin,lateminer/bitcoin,mruddy/bitcoin,namecoin/namecore,Xekyo/bitcoin,sipsorcery/bitcoin,particl/particl-core,fanquake/bitcoin,AkioNak/bitcoin,namecoin/namecore,bitcoinsSG/bitcoin,ajtowns/bitcoin