RGBMatrix: fruit demo: fix ValueError exception
The tile width setting was lost when I simplified the demo for inclusion
in the guide.  Restore it.
@@ -36,7 +36,7 @@ class Wheel(displayio.TileGrid):
def __init__(self):
# Portions of up to 3 tiles are visible.
super().__init__(bitmap=bitmap, pixel_shader=displayio.ColorConverter(),
- width=1, height=3, tile_width=20)
+ width=1, height=3, tile_width=20, tile_height=24)
self.order = shuffled(range(20))
self.state = STOPPED
self.pos = 0
