vectorio: fix up Rectangle
vectorio: fix up Rectangle

* Fix drawing 1 pixel too large
* Need to pad dirty area to ensure removed shapes are fully removed

adafruit/circuitpython,adafruit/micropython,adafruit/circuitpython,adafruit/circuitpython,adafruit/circuitpython,adafruit/micropython,adafruit/circuitpython,adafruit/circuitpython,adafruit/micropython,adafruit/micropython,adafruit/micropython