TronXY X1 handle seat

As you can tell my Design was heavily inspired by [this](https://www.thingiverse.com/thing:2481705). I don't know if it really improves the Z-wobble but it definitely looks better without the rod hanging in mid-air.

Things I did different:

- Moved the hole for the Z-rod right, so that it no longer bites in while printing at Z-heights near max.
- Inset the screw holes, that connect it to the knockoff open build extrusions to make it look nicer and give me more confidence into that connec