Remove unused function entityclass::gettype()

Not sure why this function is here. It makes sense if you know that the
game will only do certain moving platform things if you already have a
moving platform in the room, however apparently this function has
absolutely nothing to do with it.

desktop_version/src/Entity.h

@@ -91,8 +91,6 @@ public:
 
     void animateentities(int i);
 
-    bool gettype(int t);
-
     int getcompanion();
 
     int getplayer();