Fix particle restart when finestLevel() < finest_level_in_file

[dpgrote]

Summary

In the restart for particles, there is a loop up to lev = finest_level_in_file but is accessing ParticleDistributionMap(lev). In the case when finestLevel() < finest_level_in_file, this was causing an assertion error (with DEBUG) and a seg fault (without DEBUG). This fixes the loop to only go up to finestLevel(). This fixes the issue and still works properly (all of the particles are read in). This also removes the if block that would no longer ever be called.

Additional background

Curiously, previously it would work with finestLevel() < finest_level_in_file, but none of this code had changed recently. I don't know how it worked before.

Checklist

The proposed changes:

• [x] fix a bug or incorrect behavior in AMReX
• [ ] add new capabilities to AMReX
• [ ] changes answers in the test suite to more than roundoff level
• [ ] are likely to significantly affect the results of downstream AMReX users
• [ ] include documentation in the code and/or rst files, if appropriate

[atmyers]

Thank you! I think we also need to make the same change on line 924...