Updated 'MdgaServer' class.

Updated the 'MdgaServer' class by removing the serializer registration in it.

Projekte/mdga/client/src/main/java/pp/mdga/client/server/MdgaServer.java

@@ -144,7 +144,6 @@ private void initializeSerializables() {
         Serializer.registerClass(Piece.class);
         Serializer.registerClass(BonusNode.class);
         Serializer.registerClass(StartNode.class);
-        Serializer.registerClass(PlayerData.class);
         Serializer.registerClass(HomeNode.class);
 
         Serializer.registerClass(Color.class, new EnumSerializer());