fix copies to rank zero for correctness tests

[BenWibking]

Description

This fixes parallel copies of particles and/or MultiFabs to rank zero so that they actually work. In this case, constructing a amrex::DistributionMapping must be done by explicitly setting it equal to {0}.

This is used when testing the correctness of the results for the HydroRichtmyerMeshkov and BinaryOrbitCIC tests.

Thanks to Andrew Myers for the fix.

Related issues

N/A

Checklist

Before this pull request can be reviewed, all of these tasks should be completed. Denote completed tasks with an x inside the square brackets [ ] in the Markdown source below:

• I have added a description (see above).
• I have added a link to any related issues see (see above).
• I have read the Contributing Guide.
• I have added tests for any new physics that this PR adds to the code.
• I have tested this PR on my local computer and all tests pass.
• I have manually triggered the GPU tests with the magic comment /azp run.
• I have requested a reviewer for this PR.

[BenWibking]

/azp run

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[BenWibking]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 5 pipeline(s).

[BenWibking]

The CUDA build fails with the error:

/tmp/bwibking/_work/1/s/src/HydroRichtmeyerMeshkov/test_hydro2d_rm.cpp:52:62: error: call of overloaded 'DistributionMapping(<brace-enclosed initializer list>)' is ambiguous
   52 |         amrex::DistributionMapping const localDistribution({0});
      |                                                              ^
/tmp/bwibking/_work/1/s/extern/amrex/Src/Base/AMReX_DistributionMapping.H:74:10: note: candidate: 'amrex::DistributionMapping::DistributionMapping(const amrex::BoxArray&, int)'
   74 |     explicit DistributionMapping (const BoxArray& boxes,
      |          ^~~~~~~~~~~~~~~~~~~
/tmp/bwibking/_work/1/s/extern/amrex/Src/Base/AMReX_DistributionMapping.H:72:10: note: candidate: 'amrex::DistributionMapping::DistributionMapping(amrex::Vector<int>&&)'
   72 |     explicit DistributionMapping (Vector<int>&& pmap) noexcept;
      |          ^~~~~~~~~~~~~~~~~~~
/tmp/bwibking/_work/1/s/extern/amrex/Src/Base/AMReX_DistributionMapping.H:71:10: note: candidate: 'amrex::DistributionMapping::DistributionMapping(const amrex::Vector<int>&)'
   71 |     explicit DistributionMapping (const Vector<int>& pmap);
      |          ^~~~~~~~~~~~~~~~~~~

[BenWibking]

/azp run

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Azure Pipelines successfully started running 5 pipeline(s).

[BenWibking]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 5 pipeline(s).

[BenWibking]

@markkrumholz Can you review this PR?