Logitech G2x Sequential Shifter mount points

### This is a replacement of the `LOGITECH_REPLACEMENT.stl` file from https://www.thingiverse.com/thing:4419194

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The original mount ring was giving me some trouble: construction ended up wobbly and the ring didn't fit nicely to the shifter body.

I was aiming for a nice tight fitment, and I hope it can be reproduced on your setup.

Attach with 15mm M3 screws.

I have no idea how to reorient parts in the FreeCAD so please, reorient those parts manually in your slicer.