qt6: Do not use deprecated high DPI attributes in Qt 6
qt6: Do not use deprecated high DPI attributes in Qt 6

In Qt 6, high DPI pixmaps and scaling are always enabled.

https://doc.qt.io/qt-6/highdpi.html

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