Remove unnecessary argument.

Author: kattni

examples/clue_slideshow.py

@@ -7,7 +7,7 @@
 from adafruit_clue import clue
 from adafruit_slideshow import SlideShow, PlayBackDirection
 
-slideshow = SlideShow(clue.display, None, folder="/", auto_advance=False, dwell=0)
+slideshow = SlideShow(clue.display, folder="/", auto_advance=False, dwell=0)
 
 while True:
     if clue.button_b: