The dialog of the settings from the random map generator...

...was refreshed every 10ms which used a lot of cpu. Now do it only
every 100ms.

src/mapgen_dialog.cpp

@@ -312,7 +312,7 @@ void default_map_generator::user_config(display& disp)
 		update_rect(xpos,ypos,width,height);
 
 		disp.update_display();
-		disp.delay(10);
+		disp.delay(100);
 		events::pump();
 	}