[General] Use placeholder packet ID for unused CellCreate packet

apps/openmw/mwmp/processors/worldstate/ProcessorCellCreate.hpp

@@ -10,7 +10,7 @@ namespace mwmp
     public:
         ProcessorCellCreate()
         {
-            BPP_INIT(ID_CELL_CREATE)
+            BPP_INIT(ID_PLACEHOLDER)
         }
 
         virtual void Do(WorldstatePacket &packet, Worldstate &worldstate)

components/openmw-mp/NetworkMessages.hpp

@@ -108,7 +108,8 @@ enum GameMessages
     ID_WORLD_WEATHER,
 
     ID_PLAYER_ITEM_USE,
-    ID_PLAYER_CAST
+    ID_PLAYER_CAST,
+    ID_PLACEHOLDER
 };
 
 enum OrderingChannel

components/openmw-mp/Packets/Worldstate/PacketCellCreate.cpp

@@ -5,7 +5,7 @@ using namespace mwmp;
 
 PacketCellCreate::PacketCellCreate(RakNet::RakPeerInterface *peer) : WorldstatePacket(peer)
 {
-    packetID = ID_CELL_CREATE;
+    packetID = ID_PLACEHOLDER;
     orderChannel = CHANNEL_SYSTEM;
 }