e17/comp: dont set visible until !cw->hidden_override. 
e17/comp: dont set visible until !cw->hidden_override. 

trying to fix an infinite loop in when new window is added that is directly set to cw->hidden_override


SVN revision: 57689

FlorentRevest/Enlightenment,FlorentRevest/Enlightenment,rvandegrift/e,FlorentRevest/Enlightenment,tizenorg/platform.upstream.enlightenment,rvandegrift/e,tizenorg/platform.upstream.enlightenment,tizenorg/platform.upstream.enlightenment,rvandegrift/e,tasn/enlightenment,tasn/enlightenment,tasn/enlightenment