Let dz handle client removal timers

Remove all clients inside a dz, not just those assigned to instance

world/zoneserver.cpp

@@ -1398,6 +1398,7 @@ void ZoneServer::HandleMessage(uint16 opcode, const EQ::Net::Packet &p) {
 		break;
 	}
 	case ServerOP_DzCharacterChange:
+	case ServerOP_DzRemoveAllCharacters:
 	{
 		auto buf = reinterpret_cast<ServerDzCharacter_Struct*>(pack->pBuffer);
 		ZoneServer* instance_zs = zoneserver_list.FindByInstanceID(buf->instance_id);