Fix sound files

[evgeniysergeev]

This code was removed:

			/*
			 * Unpack files needed, because in some PAK files, some VOC files can have prefix 'Z'
			 * Unpacking files will unpack such files and rename. so no modifications in yaml needed.
			 * LoadScreen.Init, possibly not the best place to do this, but need to do that early, before
			 * data will be used. and do this in LoadScreen.Init just works fine.
			 */
			if (D2UnpackContent.UnpackFiles(modData, info) > 0)
			{
				// Some files unpacked. need to reload mod packages
				modData.ModFiles.LoadFromManifest(modData.Manifest);
			}

need to add some workaround for PAK files with sound files with 'Z' prefix