[HCal] Fix missing units
I built a local version of GitCondDB, DD4hep and Detector and git a crash when visualizing the whole detector. This turned out to be because I had not build DD4hep with GEANT units and a unit was missing in the HCal geometry causing a wrong z ordering in a polycone.
For the LHCb builds this has no effect, but it's more correct.
Validated by
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Core Software -
RTA -
Simulation