ENH: simplify coding logic for calculating Le() vectors.

- handle lower geometryOrder values directly within edgeAreaNormals()
  and reuse the results within Le().

- direct nonBlocking recv/send of edge normals instead using the
  intermediate processorLduInterface buffers

src/dynamicFaMesh/interfaceTrackingFvMesh/interfaceTrackingFvMesh.C

@@ -92,6 +92,7 @@ void Foam::interfaceTrackingFvMesh::initializeData()
     }
 
     // Set point normal correction for finite area mesh
+    if (!pointNormalsCorrectionPatches_.empty())
     {
         boolList& correction = aMesh().correctPatchPointNormals();