Remove unused coin attributes from finalclass and warpclass

Looks like coins were basically a scrapped mechanic, although I'm not
sure what these attributes were for. I guess counting the number of
coins in each room? But why, when you can just make a function to count
them automatically? Whatever.

desktop_version/src/WarpClass.h

@@ -11,7 +11,7 @@ class warpclass
 public:
 	const int* loadlevel(int rx, int ry);
 	std::string roomname;
-	int coin, rcol;
+	int rcol;
 	bool warpx, warpy;
 };