Update SteamWeb.cs
Update SteamWeb.cs

Authenticate SteamWeb with cookies
fjch1997/SteamBot,terryhau/SteamBot,Jessecar96/SteamBot,MattrAus/SteamBot,terryhau/SteamBot,MattrAus/SteamBot,wqbill/SteamBot,BlueRaja/SteamBot,fjch1997/SteamBot,icodingforfood/SteamBot,icodingforfood/SteamBot,wqbill/SteamBot