fix OnDiskBitmap pixel_shader

adafruit / Adafruit_CircuitPython_DisplayIO_Layout

A Circuitpython helper library for display element layout using displayio.

MIT License

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Closed FoamyGuy closed 3 years ago

FoamyGuy commented 3 years ago

These changes are needed to support the new behavior of OnDiskBitmap from this PR: https://github.com/adafruit/circuitpython/pull/4823

Without these changes it causes IconAnimated and IconWidget to not be able to show the icons properly if they have on_disk=True parameter.