Core/Chat: Explicitly ignore disabling chat feature

Port From (https://github.com/TrinityCore/TrinityCore/commit/42c44bd787458a8a0c7a12bbab874388537d61ed)

Source/Game/Handlers/ChatHandler.cs

@@ -649,5 +649,17 @@ namespace Game
             canLocalWhisperTargetResponse.Status = status;
             SendPacket(canLocalWhisperTargetResponse);
         }
+
+        [WorldPacketHandler(ClientOpcodes.UpdateAadcStatus, Processing = PacketProcessing.Inplace)]
+        void HandleChatUpdateAADCStatus(UpdateAADCStatus updateAADCStatus)
+        {
+            // disabling chat not supported
+            // send Sueccess and force chat disabled to false instead of sending that change failed
+            // this makes client change the cvar back to false instead of just printing error message in console
+            UpdateAADCStatusResponse response = new();
+            response.Success = true;
+            response.ChatDisabled = false;
+            SendPacket(response);
+        }
     }
 }

Source/Game/Networking/Packets/ChatPackets.cs

@@ -498,6 +498,33 @@ namespace Game.Networking.Packets
         }
     }
 
+    class UpdateAADCStatus : ClientPacket
+    {
+        public bool ChatDisabled;
+
+        public UpdateAADCStatus(WorldPacket packet) : base(packet) { }
+
+        public override void Read()
+        {
+            ChatDisabled = _worldPacket.HasBit();
+        }
+    }
+
+    class UpdateAADCStatusResponse : ServerPacket
+    {
+        public bool Success;
+        public bool ChatDisabled;
+
+        public UpdateAADCStatusResponse() : base(ServerOpcodes.UpdateAadcStatusResponse) { }
+
+        public override void Write()
+        {
+            _worldPacket.WriteBit(Success);
+            _worldPacket.WriteBit(ChatDisabled);
+            _worldPacket.FlushBits();
+        }
+    }
+
     public class ChatAddonMessageParams
     {
         public void Read(WorldPacket data)