K1 BIQU Microprobe mount remix

BTT Microprobe mount for the K1

Use this model with my Simple AF project:

https://pellcorp.github.io/creality-wiki/microprobe/

I trimmed the mount by 1.75mm and also slightly enlarged the holes where the mount sits so it more easily sits flush, this allowed me to trim 3mm total off the offset, from -36mm to -33mm.

I also added a slight indentation into the start of the btt mounting holes to make it a bit easier to thread the holes into the plastic, the original model it was really hard to get the process started and I ended up with wonky holes.