Fixed bug in button image sizing.
Fixed bug in button image sizing.

steffenWi/xwt,mminns/xwt,antmicro/xwt,mono/xwt,hwthomas/xwt,akrisiun/xwt,mminns/xwt,hamekoz/xwt,directhex/xwt,iainx/xwt,cra0zy/xwt,sevoku/xwt,lytico/xwt,TheBrainTech/xwt,residuum/xwt