validation: Remove review-only comments + assertions
validation: Remove review-only comments + assertions

[META] This is a followup to "validation: Move FindFilesToPrune{,Manual}
       to BlockManager" removing comments and assertions meant only to
       show that the change is correct.

AkioNak/bitcoin,MeshCollider/bitcoin,bitcoinknots/bitcoin,bitcoinknots/bitcoin,GroestlCoin/bitcoin,kallewoof/bitcoin,JeremyRubin/bitcoin,MeshCollider/bitcoin,domob1812/namecore,bitcoinknots/bitcoin,dscotese/bitcoin,yenliangl/bitcoin,GroestlCoin/bitcoin,mruddy/bitcoin,ajtowns/bitcoin,particl/particl-core,achow101/bitcoin,litecoin-project/litecoin,pataquets/namecoin-core,pstratem/bitcoin,jnewbery/bitcoin,jlopp/statoshi,prusnak/bitcoin,achow101/bitcoin,jamesob/bitcoin,MarcoFalke/bitcoin,n1bor/bitcoin,AkioNak/bitcoin,qtumproject/qtum,Xekyo/bitcoin,lateminer/bitcoin,Xekyo/bitcoin,pstratem/bitcoin,Xekyo/bitcoin,pataquets/namecoin-core,namecoin/namecore,bitcoin/bitcoin,GroestlCoin/GroestlCoin,ElementsProject/elements,fanquake/bitcoin,sstone/bitcoin,jambolo/bitcoin,practicalswift/bitcoin,mm-s/bitcoin,pstratem/bitcoin,tecnovert/particl-core,GroestlCoin/GroestlCoin,AkioNak/bitcoin,mm-s/bitcoin,dscotese/bitcoin,JeremyRubin/bitcoin,tecnovert/particl-core,pstratem/bitcoin,alecalve/bitcoin,prusnak/bitcoin,mruddy/bitcoin,cdecker/bitcoin,namecoin/namecoin-core,pataquets/namecoin-core,domob1812/bitcoin,domob1812/bitcoin,cdecker/bitcoin,dscotese/bitcoin,rnicoll/bitcoin,pataquets/namecoin-core,bitcoinsSG/bitcoin,lateminer/bitcoin,ElementsProject/elements,anditto/bitcoin,qtumproject/qtum,alecalve/bitcoin,instagibbs/bitcoin,practicalswift/bitcoin,prusnak/bitcoin,cdecker/bitcoin,jlopp/statoshi,qtumproject/qtum,sstone/bitcoin,rnicoll/dogecoin,jambolo/bitcoin,sipsorcery/bitcoin,ajtowns/bitcoin,Xekyo/bitcoin,AkioNak/bitcoin,jonasschnelli/bitcoin,rnicoll/bitcoin,instagibbs/bitcoin,instagibbs/bitcoin,EthanHeilman/bitcoin,JeremyRubin/bitcoin,anditto/bitcoin,pstratem/bitcoin,GroestlCoin/GroestlCoin,namecoin/namecoin-core,rnicoll/bitcoin,litecoin-project/litecoin,litecoin-project/litecoin,fanquake/bitcoin,namecoin/namecoin-core,rnicoll/dogecoin,domob1812/namecore,sipsorcery/bitcoin,particl/particl-core,sstone/bitcoin,ajtowns/bitcoin,mruddy/bitcoin,lateminer/bitcoin,dscotese/bitcoin,dscotese/bitcoin,lateminer/bitcoin,sstone/bitcoin,tecnovert/particl-core,MeshCollider/bitcoin,bitcoinsSG/bitcoin,pataquets/namecoin-core,jambolo/bitcoin,jnewbery/bitcoin,kallewoof/bitcoin,apoelstra/bitcoin,sstone/bitcoin,namecoin/namecore,ElementsProject/elements,jamesob/bitcoin,qtumproject/qtum,tecnovert/particl-core,tecnovert/particl-core,bitcoinsSG/bitcoin,lateminer/bitcoin,qtumproject/qtum,sipsorcery/bitcoin,Sjors/bitcoin,qtumproject/qtum,n1bor/bitcoin,GroestlCoin/bitcoin,MeshCollider/bitcoin,rnicoll/dogecoin,kallewoof/bitcoin,GroestlCoin/bitcoin,particl/particl-core,jonasschnelli/bitcoin,Sjors/bitcoin,achow101/bitcoin,particl/particl-core,mm-s/bitcoin,ajtowns/bitcoin,litecoin-project/litecoin,apoelstra/bitcoin,Xekyo/bitcoin,Sjors/bitcoin,litecoin-project/litecoin,jambolo/bitcoin,ElementsProject/elements,bitcoin/bitcoin,ajtowns/bitcoin,kallewoof/bitcoin,domob1812/bitcoin,MeshCollider/bitcoin,JeremyRubin/bitcoin,cdecker/bitcoin,andreaskern/bitcoin,JeremyRubin/bitcoin,n1bor/bitcoin,yenliangl/bitcoin,sipsorcery/bitcoin,MarcoFalke/bitcoin,domob1812/bitcoin,namecoin/namecoin-core,alecalve/bitcoin,JeremyRubin/bitcoin,EthanHeilman/bitcoin,bitcoinsSG/bitcoin,jamesob/bitcoin,bitcoin/bitcoin,qtumproject/qtum,jnewbery/bitcoin,apoelstra/bitcoin,bitcoin/bitcoin,sipsorcery/bitcoin,jambolo/bitcoin,ajtowns/bitcoin,domob1812/namecore,sipsorcery/bitcoin,dscotese/bitcoin,andreaskern/bitcoin,pstratem/bitcoin,yenliangl/bitcoin,n1bor/bitcoin,anditto/bitcoin,fujicoin/fujicoin,anditto/bitcoin,mruddy/bitcoin,AkioNak/bitcoin,MarcoFalke/bitcoin,GroestlCoin/GroestlCoin,fujicoin/fujicoin,jnewbery/bitcoin,EthanHeilman/bitcoin,MarcoFalke/bitcoin,apoelstra/bitcoin,namecoin/namecore,cdecker/bitcoin,instagibbs/bitcoin,jlopp/statoshi,practicalswift/bitcoin,fujicoin/fujicoin,yenliangl/bitcoin,domob1812/namecore,bitcoin/bitcoin,namecoin/namecoin-core,achow101/bitcoin,EthanHeilman/bitcoin,pataquets/namecoin-core,mruddy/bitcoin,prusnak/bitcoin,domob1812/namecore,EthanHeilman/bitcoin,anditto/bitcoin,jonasschnelli/bitcoin,sstone/bitcoin,alecalve/bitcoin,n1bor/bitcoin,cdecker/bitcoin,jamesob/bitcoin,andreaskern/bitcoin,yenliangl/bitcoin,ElementsProject/elements,bitcoinsSG/bitcoin,andreaskern/bitcoin,apoelstra/bitcoin,particl/particl-core,apoelstra/bitcoin,Sjors/bitcoin,particl/particl-core,practicalswift/bitcoin,yenliangl/bitcoin,rnicoll/bitcoin,EthanHeilman/bitcoin,instagibbs/bitcoin,jlopp/statoshi,rnicoll/dogecoin,jnewbery/bitcoin,jambolo/bitcoin,jonasschnelli/bitcoin,mm-s/bitcoin,achow101/bitcoin,rnicoll/dogecoin,fanquake/bitcoin,mm-s/bitcoin,fujicoin/fujicoin,prusnak/bitcoin,lateminer/bitcoin,tecnovert/particl-core,namecoin/namecore,fanquake/bitcoin,AkioNak/bitcoin,alecalve/bitcoin,andreaskern/bitcoin,MeshCollider/bitcoin,prusnak/bitcoin,jlopp/statoshi,fanquake/bitcoin,instagibbs/bitcoin,MarcoFalke/bitcoin,bitcoin/bitcoin,mruddy/bitcoin,fujicoin/fujicoin,namecoin/namecore,kallewoof/bitcoin,litecoin-project/litecoin,fanquake/bitcoin,namecoin/namecoin-core,rnicoll/bitcoin,Xekyo/bitcoin,jlopp/statoshi,practicalswift/bitcoin,jonasschnelli/bitcoin,Sjors/bitcoin,andreaskern/bitcoin,GroestlCoin/GroestlCoin,kallewoof/bitcoin,MarcoFalke/bitcoin,GroestlCoin/bitcoin,GroestlCoin/bitcoin,namecoin/namecore,practicalswift/bitcoin,rnicoll/bitcoin,jamesob/bitcoin,ElementsProject/elements,domob1812/namecore,n1bor/bitcoin,domob1812/bitcoin,jamesob/bitcoin,anditto/bitcoin,bitcoinknots/bitcoin,domob1812/bitcoin,mm-s/bitcoin,bitcoinsSG/bitcoin,GroestlCoin/GroestlCoin,fujicoin/fujicoin,bitcoinknots/bitcoin,alecalve/bitcoin,achow101/bitcoin