Code: Pet agro fix (well, if it was broken)

[IASoveraign]

I noticed my pets weren't attacking critters that attacked me, so I made a small change to attack.cpp (highlighted below).

		// Agro the client's pet if it has one.
		if (other->IsClient())
		{
			// TODO: When NPC's charm - pet might become client, not NPC -- Soveraign
			NPC * client_pet = (NPC *) other->GetPet();
			if (client_pet)
			{
				client_pet->AddToHateList(this);
			}
		}