guix: Drop "-signed" suffix for signed macOS .dmg files
guix: Drop "-signed" suffix for signed macOS .dmg files

This change makes naming of the signed artifacts consistent across
different OSes, including Windows.

fujicoin/fujicoin,AkioNak/bitcoin,bitcoin/bitcoin,namecoin/namecore,jamesob/bitcoin,kallewoof/bitcoin,jlopp/statoshi,anditto/bitcoin,namecoin/namecore,sstone/bitcoin,kallewoof/bitcoin,instagibbs/bitcoin,GroestlCoin/GroestlCoin,lateminer/bitcoin,AkioNak/bitcoin,sipsorcery/bitcoin,andreaskern/bitcoin,sstone/bitcoin,anditto/bitcoin,sstone/bitcoin,fujicoin/fujicoin,sstone/bitcoin,GroestlCoin/GroestlCoin,Xekyo/bitcoin,bitcoinsSG/bitcoin,mruddy/bitcoin,GroestlCoin/GroestlCoin,namecoin/namecoin-core,jlopp/statoshi,sstone/bitcoin,sipsorcery/bitcoin,Xekyo/bitcoin,jambolo/bitcoin,jlopp/statoshi,particl/particl-core,fanquake/bitcoin,fanquake/bitcoin,instagibbs/bitcoin,anditto/bitcoin,GroestlCoin/bitcoin,domob1812/bitcoin,achow101/bitcoin,anditto/bitcoin,domob1812/bitcoin,particl/particl-core,AkioNak/bitcoin,dscotese/bitcoin,jambolo/bitcoin,kallewoof/bitcoin,fanquake/bitcoin,jamesob/bitcoin,ajtowns/bitcoin,particl/particl-core,jambolo/bitcoin,particl/particl-core,ajtowns/bitcoin,AkioNak/bitcoin,Xekyo/bitcoin,AkioNak/bitcoin,sipsorcery/bitcoin,bitcoin/bitcoin,domob1812/bitcoin,jlopp/statoshi,bitcoin/bitcoin,andreaskern/bitcoin,fujicoin/fujicoin,jambolo/bitcoin,lateminer/bitcoin,namecoin/namecore,kallewoof/bitcoin,GroestlCoin/GroestlCoin,GroestlCoin/GroestlCoin,mruddy/bitcoin,ajtowns/bitcoin,achow101/bitcoin,ajtowns/bitcoin,jlopp/statoshi,sipsorcery/bitcoin,sipsorcery/bitcoin,andreaskern/bitcoin,bitcoinsSG/bitcoin,jlopp/statoshi,andreaskern/bitcoin,bitcoinsSG/bitcoin,lateminer/bitcoin,Xekyo/bitcoin,tecnovert/particl-core,achow101/bitcoin,GroestlCoin/bitcoin,GroestlCoin/bitcoin,AkioNak/bitcoin,andreaskern/bitcoin,namecoin/namecoin-core,tecnovert/particl-core,namecoin/namecore,achow101/bitcoin,sstone/bitcoin,Xekyo/bitcoin,mruddy/bitcoin,jamesob/bitcoin,namecoin/namecoin-core,GroestlCoin/bitcoin,bitcoinsSG/bitcoin,tecnovert/particl-core,lateminer/bitcoin,kallewoof/bitcoin,bitcoin/bitcoin,mruddy/bitcoin,instagibbs/bitcoin,particl/particl-core,GroestlCoin/bitcoin,particl/particl-core,jambolo/bitcoin,ajtowns/bitcoin,andreaskern/bitcoin,tecnovert/particl-core,tecnovert/particl-core,mruddy/bitcoin,domob1812/bitcoin,anditto/bitcoin,fujicoin/fujicoin,ajtowns/bitcoin,dscotese/bitcoin,namecoin/namecoin-core,anditto/bitcoin,namecoin/namecoin-core,jambolo/bitcoin,GroestlCoin/GroestlCoin,kallewoof/bitcoin,fujicoin/fujicoin,lateminer/bitcoin,jamesob/bitcoin,achow101/bitcoin,jamesob/bitcoin,bitcoinsSG/bitcoin,dscotese/bitcoin,sipsorcery/bitcoin,tecnovert/particl-core,instagibbs/bitcoin,domob1812/bitcoin,dscotese/bitcoin,fanquake/bitcoin,jamesob/bitcoin,fujicoin/fujicoin,instagibbs/bitcoin,fanquake/bitcoin,bitcoinsSG/bitcoin,domob1812/bitcoin,dscotese/bitcoin,namecoin/namecoin-core,lateminer/bitcoin,bitcoin/bitcoin,namecoin/namecore,namecoin/namecore,GroestlCoin/bitcoin,Xekyo/bitcoin,mruddy/bitcoin,fanquake/bitcoin,bitcoin/bitcoin,achow101/bitcoin,instagibbs/bitcoin,dscotese/bitcoin