PC Names: Same Type, Multiple Vars/Instances (#4302)

## Summary

If the same particle container type is used to create multiple particle
species, then the compile-time defined names were only added for the
first particle species (instance) of the type and then skipped for any
later species (another instance of the same type).

This is due to the global variable (so many globals...) used in the type
init. This fixes the problem by moving the instance related name logic
out of the once-per-type logic `if` branch.

## Additional background

First seen with ImpactX for its "lost" particle species (2nd instance of
the same PC type in the code).
Needed for ECP-WarpX/impactx#805

## 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

Src/Particle/AMReX_ParticleContainerI.H

@@ -42,6 +42,18 @@ ParticleContainer_impl<ParticleType, NArrayReal, NArrayInt, Allocator, CellAssig
 
     SetParticleSize();
 
+    // add default names for SoA Real and Int compile-time arguments
+    m_soa_rdata_names.clear();
+    for (int i=0; i<NArrayReal; ++i)
+    {
+        m_soa_rdata_names.push_back(getDefaultCompNameReal<ParticleType>(i));
+    }
+    m_soa_idata_names.clear();
+    for (int i=0; i<NArrayInt; ++i)
+    {
+        m_soa_idata_names.push_back(getDefaultCompNameInt<ParticleType>(i));
+    }
+
     static bool initialized = false;
     if ( ! initialized)
     {
@@ -65,16 +77,6 @@ ParticleContainer_impl<ParticleType, NArrayReal, NArrayInt, Allocator, CellAssig
         pp.queryAdd("do_mem_efficient_sort", memEfficientSort);
         pp.queryAdd("use_comms_arena", use_comms_arena);
 
-        // add default names for SoA Real and Int compile-time arguments
-        for (int i=0; i<NArrayReal; ++i)
-        {
-            m_soa_rdata_names.push_back(getDefaultCompNameReal<ParticleType>(i));
-        }
-        for (int i=0; i<NArrayInt; ++i)
-        {
-            m_soa_idata_names.push_back(getDefaultCompNameInt<ParticleType>(i));
-        }
-
         initialized = true;
     }
 }