Check is wrong inside prolongate_3d_o1_rf2.cc

The problem materialized when creating wave equation tutorials for the Teragrid conference. I was unable to run an FMR application in parallel. The check comprises lines 76-80 of the file:

if (not regbbox.expand(offsetlo, offsethi).is_contained_in(srcbbox) or
    not regbbox                           .is_contained_in(dstbbox))
{
  CCTK_WARN (0, "Internal error: region extent is not contained in array extent");
}

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