My switch has bundle of ground wires connected to a wire connector (right green wires) which is how the Kasa instructions, but then I have an additional ground wire that is connected to the switch (left green wire). This wire is not showen in the Kasa installation instructions. Should I be adding the ground wire from the Kasa HS220 to the single ground wire or adding it to the wire connector? If I should be adding it to the wire connector, what do I do with the single ground wire that was previously connected to the switch?