Copter: verify_takeoff() should set ap.takeoff_complete to True after the takeoff is complete.

ArduCopter/commands_logic.pde

@@ -462,6 +462,7 @@ static void do_loiter_time()
 static bool verify_takeoff()
 {
     // have we reached our target altitude?
+    set_takeoff_complete(wp_nav.reached_destination());
     return wp_nav.reached_destination();
 }