Fix bug affecting async IO + single precision particles (#1583)

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
- [ ] are described in the proposed changes to the AMReX documentation, if appropriate

Author: atmyers

Src/Particle/AMReX_WriteBinaryParticleData.H

@@ -497,7 +497,7 @@ void WriteBinaryParticleDataAsync (PC const& pc,
 
     auto RD = pc.ParticleRealDescriptor;
 
-    AsyncOut::Submit([=] () 
+    AsyncOut::Submit([=] ()
 #if defined(__GNUC__) && (__GNUC__ == 8) && (__GNUC_MINOR__ == 1)
                      mutable // workaround for bug in gcc 8.1
 #endif
@@ -516,7 +516,7 @@ void WriteBinaryParticleDataAsync (PC const& pc,
 
             if ( ! HdrFile.good()) amrex::FileOpenFailed(HdrFileName);
 
-            if (sizeof(typename PC::ParticleType) == 4)
+            if (sizeof(typename PC::ParticleType::RealType) == 4)
             {
                 HdrFile << PC::ParticleType::Version() << "_single" << '\n';
             }