fix failure of non-regression test SMESH_TEST/Grids/smesh/mesh_Projection_2D/A1

fix failure of non-regression test SMESH_TEST/Grids/smesh/mesh_Projection_2D/A1

+//   bool isDegenTria( const SMDS_MeshNode * nn[3] )
+//   {

+    // It was an attemp to fix a problem of a zero area face whose all nodes
+    // are on one staight EDGE. But omitting this face makes a hole in the mesh :(
+    // if ( !isDegen && allNodesAreOld )
+    //   isDegen = isDegenTria( nn );