updated the default value for --noc_swap_percentage option

With NoC initial placement, we no longer need to move NoC routers more than what the RL agent suggests.

Author: soheilshahrouz

vpr/src/base/read_options.cpp

@@ -2823,7 +2823,7 @@ argparse::ArgumentParser create_arg_parser(std::string prog_name, t_options& arg
         .help(
             "Sets the minimum fraction of swaps attempted by the placer that are NoC blocks."
             "This value is an integer ranging from 0-100. 0 means NoC blocks will be moved at the same rate as other blocks. 100 means all swaps attempted by the placer are NoC router blocks.")
-        .default_value("40")
+        .default_value("0")
         .show_in(argparse::ShowIn::HELP_ONLY);
 
     noc_grp.add_argument<std::string>(args.noc_placement_file_name, "--noc_placement_file_name")