Portal eyes: TileGrid has its own height property now

Don't try to set the height property of Sprite, because [it now inherits it from displayio.TileGrid](adafruit/circuitpython#5749).

Author: Neradoc

Matrix_Portal_Eyes/code.py

@@ -53,7 +53,6 @@ def __init__(self, filename, transparent=None):
         elif isinstance(transparent, int):
             palette.make_transparent(transparent)
         super(Sprite, self).__init__(bitmap, pixel_shader=palette)
-        self.height = bitmap.height
 
 
 # ONE-TIME INITIALIZATION --------------------------------------------------