Doryani's Prototype modifier does not work with 0% Lightning Resistance

"Nearby Enemies have Lightning Resistance equal to yours"

Tested in PVP:

* with 0% Lightning resistance, the resistance of the enemy player and their minions are not modified (either Positive or Negative)
* with non-zero Lightning resistance, the resistance is modified as expected.

Tested in PVE:

* with 0% Lightning resistance, the resistance of a monster with positive Lightning Resistance is not modified
* Enemy resistances can be further modified via Conductivity with above scenario