Use nbt_payload type instead of decltype hack

src/nbt/NBT.cpp

@@ -36,7 +36,7 @@ namespace NBT
     {
         // In C, the type could have been 'const struct nbt_list'
         // but in C++ we have to use this monstrosity because of anonymous innter structs
-        return list_entry(item, const decltype(nbt_node::payload)::nbt_list, entry)->data;
+        return list_entry(item, nbt_node::nbt_payload::nbt_list, entry)->data;
     }
 
     DataBuffer::~DataBuffer()