Core/PacketIO: Fixed writing dynamic updatefield mask when size is exactly 32

Port From (https://github.com/TrinityCore/TrinityCore/commit/d3bf53772b47924f43553e169ba3c121307c55c8)

Source/Game/Entities/Object/Update/UpdateField.cs

@@ -178,6 +178,12 @@ namespace Game.Entities
                         data.WriteUInt32(_updateMask[block]);
             }
 
+            else if (_values.Count == 32)
+            {
+                data.WriteBits(_updateMask.Last(), 32);
+                return;
+            }
+
             if ((_values.Count % 32) != 0)
                 data.WriteBits(_updateMask.Last(), _values.Count % 32);
         }