sharp96: update examples for alternative display sizes and inversion

Using (for example)
https://www.tindie.com/products/kuzyatech/sharp-memory-lcd-breakout-a2/
but connecting to the same pins as the boosterpack this can be used to
validate other display sizes.  Standard displays (that don't have
mirrors) confirm that defaulting to bitwise-invert the image produces a
more readable product, so change that in u8glib.