STYLE: Duplicate information in SHM reference dict

// Optional: keep zero-sized patches. By default snappyHexMesh filters
//           these out.
//keepPatches    true; // default false


//Optional: preserve all generated patches. Default is to remove
//          zero-sized patches.
//keepPatches true;

in applications/utilities/mesh/generation/snappyHexMesh/snappyHexMeshDict