remove fog start and fog end parameters

src/twn_loop.c

@@ -604,7 +604,6 @@ static bool initialize(void) {
     ctx.window_mouse_resident = true;
 
     ctx.game.fog_color = (Color){ 255, 255, 255, 255 }; /* TODO: pick some grey? */
-    ctx.game.fog_end = 1.0f;
 
     update_viewport();