Remove useless variable Game::telecookieexists

Although it keeps getting set to true and false in various places, it
never once gets checked, essentially deeming it a variable that's used
but does nothing.

desktop_version/src/Game.h

@@ -234,7 +234,6 @@ public:
     std::vector<int>bestlives;
     std::vector<int> bestrank;
 
-    bool telecookieexists;
     bool quickcookieexists;
 
     std::string tele_gametime;