kivy: improve checkbox_dialog layout
kivy: improve checkbox_dialog layout

argentumproject/electrum-arg,fujicoin/electrum-fjc,wakiyamap/electrum-mona,cryptapus/electrum-uno,argentumproject/electrum-arg,romanz/electrum,pknight007/electrum-vtc,pooler/electrum-ltc,asfin/electrum,digitalbitbox/electrum,spesmilo/electrum,dashpay/electrum-dash,spesmilo/electrum,pooler/electrum-ltc,aasiutin/electrum,molecular/electrum,neocogent/electrum,digitalbitbox/electrum,neocogent/electrum,dashpay/electrum-dash,wakiyamap/electrum-mona,fujicoin/electrum-fjc,spesmilo/electrum,dabura667/electrum,imrehg/electrum,cryptapus/electrum-uno,vialectrum/vialectrum,vertcoin/electrum-vtc,kyuupichan/electrum,wakiyamap/electrum-mona,argentumproject/electrum-arg,imrehg/electrum,dabura667/electrum,asfin/electrum,procrasti/electrum,molecular/electrum,fireduck64/electrum,vertcoin/electrum-vtc,pknight007/electrum-vtc,protonn/Electrum-Cash,imrehg/electrum,asfin/electrum,molecular/electrum,aasiutin/electrum,fyookball/electrum,FairCoinTeam/electrum-fair,fireduck64/electrum,procrasti/electrum,digitalbitbox/electrum,cryptapus/electrum-myr,vialectrum/vialectrum,molecular/electrum,cryptapus/electrum-uno,neocogent/electrum,fireduck64/electrum,pknight007/electrum-vtc,fireduck64/electrum,vertcoin/electrum-vtc,protonn/Electrum-Cash,spesmilo/electrum,procrasti/electrum,fujicoin/electrum-fjc,dashpay/electrum-dash,protonn/Electrum-Cash,cryptapus/electrum,cryptapus/electrum,digitalbitbox/electrum,kyuupichan/electrum,pooler/electrum-ltc,FairCoinTeam/electrum-fair,pknight007/electrum-vtc,FairCoinTeam/electrum-fair,FairCoinTeam/electrum-fair,cryptapus/electrum-myr,protonn/Electrum-Cash,romanz/electrum,aasiutin/electrum,dashpay/electrum-dash,cryptapus/electrum-myr,romanz/electrum,kyuupichan/electrum,vertcoin/electrum-vtc,procrasti/electrum,dabura667/electrum,wakiyamap/electrum-mona,imrehg/electrum,dabura667/electrum,cryptapus/electrum-myr,vialectrum/vialectrum,argentumproject/electrum-arg,fyookball/electrum,aasiutin/electrum,cryptapus/electrum,pooler/electrum-ltc,fyookball/electrum,cryptapus/electrum-uno