Demo update

Fixed a bug where removed effects were still displayed in the client’s effect list. Fixed a bug where enemies appeared to walk in place for clients when the Hand effect was applied. Fixed a bug where the Steam status always showed 0/4 players regardless of the actual number. The tutorial board can now be pushed. Added a second wall of erasers after the Jump item in the demo level. Players who remain in a level after the portal closes now receive the Forsaken effect, which kills them. Updated to a more secure version of Unity Editor. Updated the application icon.