count_events.sh: use both s3https:// and root:// for hepmc3.tree.root
In addition to requiring a copy on the JLab xrootd server, we should also use the s3 storage for event counting.
Edited by Wouter Deconinck
In addition to requiring a copy on the JLab xrootd server, we should also use the s3 storage for event counting.