Core/PacketIO: Reduce size of SMSG_UPDATE_OBJECT by trimming trailing zeros in values updatemask

src/server/game/Entities/Unit/Unit.cpp

@@ -14204,7 +14204,6 @@ void Unit::BuildValuesUpdate(uint8 updateType, ByteBuffer* data, Player* target)
         return;
 
     ByteBuffer fieldBuffer;
-    UpdateMask updateMask;
 
     uint32 valCount = m_valuesCount;
 
@@ -14216,7 +14215,7 @@ void Unit::BuildValuesUpdate(uint8 updateType, ByteBuffer* data, Player* target)
     else if (GetTypeId() == TYPEID_PLAYER)
         valCount = PLAYER_END_NOT_SELF;
 
-    updateMask.SetCount(valCount);
+    UpdateMaskPacketBuilder updateMask(valCount);
 
     Player* plr = GetCharmerOrOwnerPlayerOrPlayerItself();
     if (GetOwnerGUID() == target->GetGUID())
@@ -14365,7 +14364,6 @@ void Unit::BuildValuesUpdate(uint8 updateType, ByteBuffer* data, Player* target)
         }
     }
 
-    *data << uint8(updateMask.GetBlockCount());
     updateMask.AppendToPacket(data);
     data->append(fieldBuffer);
 }