incorrect path for copying steam_appid.txt

[Gillissie]

Based on the installation location in Unity, this path for copying steam_appid.txt is incorrect. Perhaps it should either be: Assets/com.rlabrecque.steamworks.net or Assets/Steamworks.NET/

public class RedistInstall { static RedistInstall() { CopyFile("Assets/Plugins/Steamworks.NET/redist", "steam_appid.txt", false);