AreaSeries: corrected default fill color
AreaSeries: corrected default fill color

Rustemt/oxyplot,BRER-TECH/oxyplot,Mitch-Connor/oxyplot,as-zhuravlev/oxyplot_wpf_fork,jeremyiverson/oxyplot,DotNetDoctor/oxyplot,ze-pequeno/oxyplot,bbqchickenrobot/oxyplot,as-zhuravlev/oxyplot_wpf_fork,Jofta/oxyplot,br111an/oxyplot,H2ONaCl/oxyplot,lynxkor/oxyplot,br111an/oxyplot,jeremyiverson/oxyplot,NilesDavis/oxyplot,Rustemt/oxyplot,oxyplot/oxyplot,Jonarw/oxyplot,Mitch-Connor/oxyplot,Sbosanquet/oxyplot,lynxkor/oxyplot,Rustemt/oxyplot,zur003/oxyplot,bbqchickenrobot/oxyplot,shoelzer/oxyplot,mattleibow/oxyplot,objorke/oxyplot,H2ONaCl/oxyplot,H2ONaCl/oxyplot,freudenthal/oxyplot,svendu/oxyplot,mattleibow/oxyplot,Sbosanquet/oxyplot,svendu/oxyplot,olegtarasov/oxyplot,HermanEldering/oxyplot,sevoku/oxyplot,TheAlmightyBob/oxyplot,objorke/oxyplot,Isolocis/oxyplot,GeertvanHorrik/oxyplot,Kaplas80/oxyplot,GeertvanHorrik/oxyplot,GeertvanHorrik/oxyplot,as-zhuravlev/oxyplot_wpf_fork,sevoku/oxyplot,freudenthal/oxyplot,BRER-TECH/oxyplot,Sbosanquet/oxyplot,HermanEldering/oxyplot,freudenthal/oxyplot,jeremyiverson/oxyplot,TheAlmightyBob/oxyplot,br111an/oxyplot,shoelzer/oxyplot,Kaplas80/oxyplot,svendu/oxyplot,Mitch-Connor/oxyplot,DotNetDoctor/oxyplot,TheAlmightyBob/oxyplot,shoelzer/oxyplot,lynxkor/oxyplot,olegtarasov/oxyplot,objorke/oxyplot,bbqchickenrobot/oxyplot