Fix OpenPMD smoke check logic for numValues and dataset size

[markcmiller86]

Discussed in https://github.com/visit-dav/visit/discussions/19514

^{Originally posted by wlin8633 May 14, 2024} Dear developer team, I have recently tried to use Visit of version 3.3.3 to visualize some data from WarpX 24.04 using serial engine and got the following error. I've checked that the amount of memory required to load the data is sufficient. It's about 125 MB per file and saved in OpenPMD format using HDF5 backend. If I visualize everything using parallel engine, everything just works fine. However, it's quite unconvenient to always use parallel engine when dealing with small datasets. The attachment is one of the dump file. Thank you so much for your great work.

ERROR: Pseudocolor: () viewer.exe: There was an error opening /data/0/fields//E/x: Invalid size for the current dataset (3032064 25165824)

openpmd_000000.zip