Update adafruit_framebuf.py

this indentation is driving me crazy.

Author: Pascal Deneaux

adafruit_framebuf.py

@@ -274,7 +274,7 @@ def scroll(self, delta_x, delta_y):
             x = shift_x
             while x != xend:
                 self.format.set_pixel(
-                  self, x, y, self.format.get_pixel(self, x - delta_x, y - delta_y))
+                    self, x, y, self.format.get_pixel(self, x - delta_x, y - delta_y))
                 x += dt_x
             y += dt_y