Core/PacketIO: Fixed structure of SMSG_START_TIMER

Port From (https://github.com/TrinityCore/TrinityCore/commit/06010c11b138752e475c59a594b42d4e9a7241bd)

Source/Framework/Constants/SharedConst.cs

@@ -1803,7 +1803,8 @@ namespace Framework.Constants
     public enum TimerType
     {
         Pvp = 0,
-        ChallengerMode = 1
+        ChallengerMode = 1,
+        PlayerCountdown = 2
     }
 
     public enum GameError : uint

Source/Game/Networking/Packets/MiscPackets.cs

@@ -1258,14 +1258,14 @@ namespace Game.Networking.Packets
 
         public override void Write()
         {
-            _worldPacket.WriteUInt32((uint)Type);
-            _worldPacket.WriteUInt32(TimeLeft);
             _worldPacket.WriteUInt32(TotalTime);
+            _worldPacket.WriteUInt32(TimeLeft);
+            _worldPacket.WriteInt32((int)Type);
         }
 
-        public TimerType Type;
-        public uint TimeLeft;
         public uint TotalTime;
+        public uint TimeLeft;
+        public TimerType Type;
     }
 
     class ConversationLineStarted : ClientPacket