Update monitor.py to use the new sleep and wake functions

also moved wake one line forward so the display isn't on but not updated while rendering

Author: tomjn

examples/monitor.py

@@ -1135,11 +1135,11 @@ def handle_button(pin):
         viewcontroller.update()
 
         if light_level_low and config.get_general().get("black_screen_when_light_low"):
-            display.set_backlight(GPIO.LOW)
+            display.sleep()
             display.display(image_blank.convert("RGB"))
         else:
-            display.set_backlight(GPIO.HIGH)
             viewcontroller.render()
+            display.wake()
             display.display(image.convert("RGB"))
 
         config.set_general(