Blueprint reader: Fix to_silo logic for species

[JustinPrivitera]

visit/src/databases/Blueprint/avtBlueprintFileFormat.C

Lines 3518 to 3525 in 13653c8

	Node n_silo_matset;
	conduit::blueprint::mesh::matset::to_silo(n_matset,
	n_silo_matset);
	Node n_silo_specset;
	conduit::blueprint::mesh::specset::to_silo(n_specset,
	n_matset,
	n_silo_specset);

This is set up incorrectly. We don't need to run to_silo on the matset; it goes unused.