qt: Untie irrelevant signal-slot parameters
qt: Untie irrelevant signal-slot parameters

QAbstractButton::clicked signal has the `checked` parameter that is
irrelevant to RPCConsole::clear slot parameter.

instagibbs/bitcoin,fujicoin/fujicoin,particl/particl-core,bitcoinsSG/bitcoin,namecoin/namecoin-core,GroestlCoin/bitcoin,prusnak/bitcoin,GroestlCoin/bitcoin,jambolo/bitcoin,pataquets/namecoin-core,tecnovert/particl-core,yenliangl/bitcoin,sstone/bitcoin,kallewoof/bitcoin,Xekyo/bitcoin,MarcoFalke/bitcoin,jambolo/bitcoin,bitcoin/bitcoin,jlopp/statoshi,GroestlCoin/GroestlCoin,MarcoFalke/bitcoin,GroestlCoin/GroestlCoin,domob1812/namecore,fanquake/bitcoin,achow101/bitcoin,bitcoinsSG/bitcoin,fanquake/bitcoin,achow101/bitcoin,namecoin/namecore,kallewoof/bitcoin,achow101/bitcoin,MarcoFalke/bitcoin,domob1812/namecore,rnicoll/bitcoin,anditto/bitcoin,MarcoFalke/bitcoin,yenliangl/bitcoin,GroestlCoin/bitcoin,qtumproject/qtum,domob1812/namecore,lateminer/bitcoin,pataquets/namecoin-core,bitcoinknots/bitcoin,domob1812/bitcoin,mm-s/bitcoin,domob1812/bitcoin,lateminer/bitcoin,domob1812/bitcoin,mm-s/bitcoin,jamesob/bitcoin,particl/particl-core,ajtowns/bitcoin,kallewoof/bitcoin,anditto/bitcoin,mm-s/bitcoin,MarcoFalke/bitcoin,JeremyRubin/bitcoin,bitcoin/bitcoin,namecoin/namecoin-core,AkioNak/bitcoin,namecoin/namecore,GroestlCoin/bitcoin,lateminer/bitcoin,instagibbs/bitcoin,GroestlCoin/GroestlCoin,namecoin/namecoin-core,yenliangl/bitcoin,jamesob/bitcoin,apoelstra/bitcoin,qtumproject/qtum,andreaskern/bitcoin,jlopp/statoshi,bitcoinsSG/bitcoin,andreaskern/bitcoin,qtumproject/qtum,tecnovert/particl-core,dscotese/bitcoin,bitcoinsSG/bitcoin,sipsorcery/bitcoin,particl/particl-core,ElementsProject/elements,pataquets/namecoin-core,fanquake/bitcoin,JeremyRubin/bitcoin,dscotese/bitcoin,sipsorcery/bitcoin,fujicoin/fujicoin,sstone/bitcoin,ajtowns/bitcoin,mruddy/bitcoin,domob1812/bitcoin,andreaskern/bitcoin,namecoin/namecore,fujicoin/fujicoin,prusnak/bitcoin,Xekyo/bitcoin,GroestlCoin/GroestlCoin,andreaskern/bitcoin,andreaskern/bitcoin,AkioNak/bitcoin,bitcoin/bitcoin,instagibbs/bitcoin,kallewoof/bitcoin,jambolo/bitcoin,yenliangl/bitcoin,namecoin/namecore,sstone/bitcoin,yenliangl/bitcoin,mm-s/bitcoin,domob1812/namecore,kallewoof/bitcoin,mm-s/bitcoin,sstone/bitcoin,jamesob/bitcoin,Xekyo/bitcoin,pataquets/namecoin-core,dscotese/bitcoin,ElementsProject/elements,rnicoll/bitcoin,JeremyRubin/bitcoin,bitcoin/bitcoin,fanquake/bitcoin,AkioNak/bitcoin,Xekyo/bitcoin,anditto/bitcoin,bitcoinknots/bitcoin,qtumproject/qtum,apoelstra/bitcoin,fanquake/bitcoin,mruddy/bitcoin,particl/particl-core,namecoin/namecoin-core,bitcoin/bitcoin,bitcoin/bitcoin,bitcoinknots/bitcoin,dscotese/bitcoin,JeremyRubin/bitcoin,ajtowns/bitcoin,pataquets/namecoin-core,anditto/bitcoin,instagibbs/bitcoin,domob1812/namecore,JeremyRubin/bitcoin,tecnovert/particl-core,MarcoFalke/bitcoin,jamesob/bitcoin,JeremyRubin/bitcoin,instagibbs/bitcoin,apoelstra/bitcoin,jambolo/bitcoin,instagibbs/bitcoin,fujicoin/fujicoin,GroestlCoin/GroestlCoin,jambolo/bitcoin,jlopp/statoshi,AkioNak/bitcoin,andreaskern/bitcoin,achow101/bitcoin,sstone/bitcoin,rnicoll/bitcoin,prusnak/bitcoin,prusnak/bitcoin,mruddy/bitcoin,mruddy/bitcoin,apoelstra/bitcoin,GroestlCoin/bitcoin,GroestlCoin/GroestlCoin,ElementsProject/elements,apoelstra/bitcoin,bitcoinsSG/bitcoin,tecnovert/particl-core,achow101/bitcoin,namecoin/namecoin-core,ajtowns/bitcoin,jlopp/statoshi,AkioNak/bitcoin,ElementsProject/elements,mm-s/bitcoin,yenliangl/bitcoin,tecnovert/particl-core,mruddy/bitcoin,qtumproject/qtum,namecoin/namecore,particl/particl-core,prusnak/bitcoin,domob1812/bitcoin,qtumproject/qtum,dscotese/bitcoin,anditto/bitcoin,rnicoll/bitcoin,anditto/bitcoin,rnicoll/bitcoin,particl/particl-core,achow101/bitcoin,lateminer/bitcoin,GroestlCoin/bitcoin,kallewoof/bitcoin,AkioNak/bitcoin,ajtowns/bitcoin,ElementsProject/elements,sipsorcery/bitcoin,sipsorcery/bitcoin,Xekyo/bitcoin,bitcoinknots/bitcoin,jambolo/bitcoin,pataquets/namecoin-core,bitcoinsSG/bitcoin,Xekyo/bitcoin,jamesob/bitcoin,sstone/bitcoin,dscotese/bitcoin,lateminer/bitcoin,bitcoinknots/bitcoin,lateminer/bitcoin,domob1812/namecore,ElementsProject/elements,jamesob/bitcoin,mruddy/bitcoin,sipsorcery/bitcoin,fujicoin/fujicoin,apoelstra/bitcoin,qtumproject/qtum,domob1812/bitcoin,fanquake/bitcoin,fujicoin/fujicoin,tecnovert/particl-core,rnicoll/bitcoin,sipsorcery/bitcoin,jlopp/statoshi,prusnak/bitcoin,namecoin/namecoin-core,jlopp/statoshi,ajtowns/bitcoin,namecoin/namecore