Remove now-unused function mapclass::fillareamap()

This is no longer needed since we load the areamap directly, instead of
having strings as unnecessary middlemen for our tilemap.

desktop_version/src/Map.h

@@ -58,8 +58,6 @@ public:
 
     bool collide(int x, int y);
 
-    void fillareamap(std::vector<std::string>& tmap);
-
     void settile(int xp, int yp, int t);