e - fix dnd problems coming from getting top object in comp canvas
e - fix dnd problems coming from getting top object in comp canvas

so getting top object was broken. it didnt account for repeat event
objects that would be included. so get the full l,ist and walk them
top to bottom for the first one thats a client. THAT is the correct
thing to do. this would affect both x11 and wayland.

@fix

tasn/enlightenment,tasn/enlightenment,tasn/enlightenment