ENH: sampledSets: have sorted distance on master set

This is more logical - the points are passed in sorted as well and there is
no way for the master sampledset to determine the ordering.

src/sampling/sampledSet/sampledSets/sampledSets.C

@@ -119,7 +119,7 @@ void Foam::sampledSets::combineSampledSets
                 samplePts.name(),
                 samplePts.axis(),
                 List<point>(UIndirectList<point>(allPts, indexSets[setI])),
-                allCurveDist
+                sortedDist
             )
         );
     }