Fix multi screen follow_mouse_focus == False
Fix multi screen follow_mouse_focus == False

Don't follow the mouse to another screen if follow_mouse_focus is not enabled
in the config.

Thanks to @motaboy for the fix. Closes #156

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