BoundaryAngles: fix for the first/last point

Plugin/BoundaryAngles.cpp

@@ -128,7 +128,6 @@ PView *GMSH_BoundaryAnglesPlugin::execute(PView *v)
           }
         }
         // Handle last elements
-        nodes[0].push_back(nodes[0][0]);
         nodes[0].push_back(nodes[0][1]);
         // Compute angle at each point (mod 2pi)
         for(std::size_t i = 0; i < nodes[0].size() - 2; i++) {