fix bug in background photo

Author: lynnlangit

src/main/java/org/teachingkidsprogramming/recipes/completed/section04mastery/BackgroundPhoto.java

@@ -32,7 +32,7 @@ public static void main(String[] args)
       //     Set the Y position of the tortoise to 65 pixels --#2.1
       Tortoise.setY(65);
       //     Turn the tortoise 1/3rd of 360 degrees to the right --#4
-      Tortoise.turn(360 / 4);
+      Tortoise.turn(360 / 3);
       //     Turn the tortoise 1 more degree --#5
       Tortoise.turn(1);
       //  End Repeat --#7.2