Draft: Fix coordinate system for b-lines

This is a fix of the coordinate system where b-lines are applied. Specifically, the origin is moved in the radial direction from the center of the chamber (as calculated including top/bottom frames) to the center of the active area (without including frames). So there's a ~1mm displacement in cases where the top/bottom frames are not equal. Especially for sTGC QL3, the difference is ~20mm because the origin is defined to be on the cutoff base of the diamond shape.

The changes were presented to the muon community at the Muon Detector Performance meeting, on July 5, 2023

Tagging @pscholer who is validating this.