Remove unneeded overlay function.
Remove unneeded overlay function.

Codegyre/Robo,duxet/Robo,iMi-digital/iRobo,Korikulum/Robo,iMi-digital/iRobo,boedah/Robo,davidrjonas/Robo,duxet/Robo,iMi-digital/iRobo