Modify Nybble xPlate parts to match kit

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Based on the discussion in b88dd303bda0f819db8b70c161c7109a836c7147 (comment), I made some rough mods to these files to produce the 3 variations I received in my Nybble kit.

Not sure if you're willing to use these since they're not perfect, but figured I'd offer anyway. I printed them today and confirmed they match exactly with the ones in my kit (apart from very slight corner radius difference on the adjusted holes).

Links to the 3d previews and how many of them I had in my kit:

• (2x) Nybble_xPlate.stl
• (1x) Nybble_xPlate_1hole.stl (wasn't sure what to name this one, let me know if you have a better name)
• (1x) Nybble_xPlateForPi.stl