regress: Use new combined hex syntax for adnstest types

This makes the tests clearer to read.  No functional change.

Change was made with

  for f in regress/*.sys; do perl -i~ -p ../t.pl $f; done

where t.pl is this script

  if ($.==1) { $at=m{^(?:\./)?adnstest\b}; }
  if ($at && $.==2 && m/^:/) {
      m/^:(\S+)/ or die;
      $r=$'; #';
      $_=$1;
      s{\b(\d+)\b}{
	  sprintf "0x%x|%d", ($1 & ~0xffff), ($1 & 0xffff)
      }ge;
      $_=":$_$r";
  }

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>