Fix offset in recv buffer of single precision particle communication

A similar bug was fixed in #3758 for the particle send buffer. But we did
not notice the issue in the receive buffer at the time. The offset for the
`i`th buffer might be aligned for the `i`th buffer's communication data
type, not the previous buffer.

Src/Particle/AMReX_ParticleCommunication.H

@@ -481,10 +481,10 @@ void communicateParticlesStart (const PC& pc, ParticleCopyPlan& plan, const SndB
     for (int i = 0; i < NProcs; ++i) {
         if (plan.m_rcv_num_particles[i] > 0) {
             RcvProc.push_back(i);
-            rOffset.push_back(TotRcvBytes);
             Long nbytes = plan.m_rcv_num_particles[i]*psize;
             std::size_t acd = ParallelDescriptor::sizeof_selected_comm_data_type(nbytes);
             TotRcvBytes = Long(amrex::aligned_size(acd, TotRcvBytes));
+            rOffset.push_back(TotRcvBytes);
             TotRcvBytes += Long(amrex::aligned_size(acd, nbytes));
             plan.m_rcv_pad_correction_h.push_back(plan.m_rcv_pad_correction_h.back() + nbytes);
         }