default x and y inside init

tested with simpletest and the anchor point test linked above.

Author: FoamyGuy

adafruit_display_text/label.py

@@ -66,6 +66,8 @@ def __init__(self, font, *, text=None, max_glyphs=None, color=0xffffff,
         self.font = font
         self._text = None
         self._anchor_point = (0, 0)
+        self.x = 0
+        self.y = 0
 
         self.palette = displayio.Palette(2)
         self.palette.make_transparent(0)