Fixed CollisionObject signals do not trigger on Area

(cherry picked from commit d7387e8a6831bb6fc0fb966d7245751eab5240cb)

scene/3d/area.cpp

@@ -756,7 +756,6 @@ Area::Area() :
 	monitorable = false;
 	collision_mask = 1;
 	collision_layer = 1;
-	set_ray_pickable(false);
 	set_monitoring(true);
 	set_monitorable(true);