fix npc not spawning

[Controllerdestiny]

In 1457, you can't directly replace the NewNPCInstanceInSlot method. The NewNPCInstanceInSlot method plays the role of generating NPC packets.

privte static NPC NewNPCInstanceInSlot(int slot, byte generation)
{
	if (Main.netMode == 2 && Main.npc[slot].spawnNeedsSyncing)
	{
		NetMessage.SendData(23, -1, -1, null, slot);
	}
	if (Main.netMode == 1)
	{
		Invariant.Assert(generation != 0, "NewNPCInstanceInSlot called on client without generation?");
	}
	else
	{
		generation = (byte)(Main.npc[slot].generation + 1);
		if (generation == 0)
		{
			generation++;
		}
	}
	NPC nPC = new NPC();
	Main.npc[slot] = nPC;
	nPC.whoAmI = slot;
	nPC.generation = generation;
	ResetNPCSlotData(slot);
	return nPC;
}

[SignatureBeef]

Missed calling the new function in the 1457 patch - opted to try this bfb4559
Prior this hook was simply to replace the NPC ctor, and no longer is the case.
NPCs seem to spawn now.