Make DynRankView fencing consistent

[MicheldeMessieres]

In Kokkos_CopyViews.hpp at line 1909 we have fences before and after the copy:

Kokkos::fence();
if ((void*)dst.data() != (void*)src.data()) {
  Kokkos::Impl::DeepCopy<dst_memory_space, src_memory_space>(
      dst.data(), src.data(), nbytes);
}
Kokkos::fence();

But in Kokkos_DynRankView.hpp we have no fences for:

Line 1906:
Kokkos::Impl::DeepCopy<dst_memory_space, src_memory_space>(
dst.data(), src.data(), nbytes);

Line 1935:
Kokkos::Impl::DeepCopy<dst_memory_space, src_memory_space>(
dst.data(), src.data(), nbytes);

These should be added for consistency and possibly other spots as well.