Forward hcal and insert can't be visualized properly

[veprbl]

Environment: (where does this bug occur, have you tried other environments)

• Which branch (main for latest released): main
• Which revision (HEAD for the most recent):
• Any specific OS or system where the issue occurs?
• Any special versions of ROOT or Geant4?

Steps to reproduce: (give a step by step account of how to trigger the bug)

1. Try to display at the insert geometry geometry

Expected Result: (what do you expect when you execute the steps above)

Actual Result: (what do you get when you execute the steps above)

This may have to do with incorrect handling of volume subtraction in TGeo visualizer