remove uneeded EnableMetadata calls

examples/mixed-wireless.cc

@@ -116,9 +116,6 @@ main (int argc, char *argv[])
   //
   cmd.Parse (argc, argv);
 
-  // The metadata system (off by default) is used by ascii tracing below
-  Packet::EnableMetadata ();
-
   /////////////////////////////////////////////////////////////////////////// 
   //                                                                       //
   // Construct the backbone                                                //

examples/mixed-wireless.py

@@ -97,9 +97,6 @@ def main(argv):
     # 
     cmd.Parse(argv)
 
-    #  The metadata system(off by default) is used by ascii tracing below
-    ns3.Packet.EnableMetadata()
-
     # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # / 
     #                                                                        # 
     #  Construct the backbone                                                #