update yt frontend for exotically named nuclei

[brady-ryan]

yt Pull #4908 changes the way that the names of nuclei are interpreted. Due to this, an error is raised for species data that is not of the designated naming format. For example, when trying to plot a Castro dataset with something such as X(P_nse), we get: ValueError: 'X(P_nse)' doesn't match expected regular expression. The root of the error stems from line 515 of yt/frontends/amrex/fields.py.

[zingale]

this is fixed in yt-project/yt#5115