Move temp int off of Game

This temp variable isn't used anywhere else, and even if it was it's set
to something every time it's used, so there's no risk of this commit
breaking any backwards compatibility.

desktop_version/src/Game.h

@@ -161,7 +161,7 @@ public:
     int door_down;
     int roomx, roomy, roomchangedir;
     int prevroomx, prevroomy;
-    int temp, j, k;
+    int j, k;
 
     int savex, savey, saverx, savery;
     int savegc, savedir;