Fixed healing property on triggered damage

[TheBv]

Event_PlayerDamage was basically just accessing the wrong index of the m_uiLastHealOnHit array. Also reset the number to make sure it won't log (healing "x") over and over again. One example of this happening: logs.tf/3056638 but there's many more

[F2]

Maybe store the index in a variable, so we don't have to compute it twice?

int iAttackerIndex = IndexOfEdict(pEdictAttacker)-1;