Missing MPGD Hits

**Is your feature request related to a problem? Please describe.**
Yes. After running ddsim only about 20% of the simulated events show up as hits in the MPGD layers. This is due to a default energy cut of 1keV being applied. Setting this cut to 0 keV I then see 100% of the hits show up in the MPGD layers. This was applied by adding the following filter to my ddsim steering file:


When running with npsim and using the steering file above, but commenting out the last two "filter" related lines I also see the loss of hits in the MPGD layers. So it seems npsim also uses a 1 keV energy cut by default.

**Describe the solution you'd like**
Set default energy deposition cut for the trackers to 0 keV