Wrong MNDX_xdev_space body tracking calibration offset

[JulianGro]

MNDX_xdev_space calibration appears to not take left or right offsets into account. Putting the tracker in the center of you back or belly works as expected. Putting it on your side, offsets your avatar to the opposite side. For example, putting it on your right side moves your avatar's hip to the left.

[ada-tv]

The trackers currently have a hardcoded sink-in depth. Replacing that with a proper tracker-to-bone offset would resolve this.