Remove kludge_to_bg() and bg_to_kludge()

Now that tower, title, and horizontal/veritcal warp backgrounds all use
separate buffers, there's no longer any need to temporarily store
variables as a workaround for the buffers stepping on each other.

desktop_version/src/Map.h

@@ -165,12 +165,6 @@ public:
 
     //Map cursor
     int cursorstate, cursordelay;
-
-    int kludge_bypos;
-    int kludge_colstate;
-    int kludge_scrolldir;
-    void bg_to_kludge();
-    void kludge_to_bg();
 };
 
 #ifndef MAP_DEFINITION