update _NET_ACTIVE_WINDOW when focus change
update _NET_ACTIVE_WINDOW when focus change

this fixes display the active task in third party tasklists

apinsard/qtile,soulchainer/qtile,frostidaho/qtile,kiniou/qtile,andrewyoung1991/qtile,flacjacket/qtile,soulchainer/qtile,de-vri-es/qtile,qtile/qtile,encukou/qtile,aniruddhkanojia/qtile,nxnfufunezn/qtile,rxcomm/qtile,aniruddhkanojia/qtile,xplv/qtile,ramnes/qtile,frostidaho/qtile,cortesi/qtile,ramnes/qtile,w1ndy/qtile,zordsdavini/qtile,farebord/qtile,kopchik/qtile,himaaaatti/qtile,kseistrup/qtile,rxcomm/qtile,kopchik/qtile,xplv/qtile,jdowner/qtile,kiniou/qtile,himaaaatti/qtile,jdowner/qtile,dequis/qtile,dequis/qtile,farebord/qtile,StephenBarnes/qtile,kynikos/qtile,de-vri-es/qtile,w1ndy/qtile,EndPointCorp/qtile,apinsard/qtile,kynikos/qtile,tych0/qtile,StephenBarnes/qtile,qtile/qtile,flacjacket/qtile,andrewyoung1991/qtile,encukou/qtile,EndPointCorp/qtile,zordsdavini/qtile,nxnfufunezn/qtile,kseistrup/qtile,tych0/qtile,cortesi/qtile