Activate bus enable switch in Verilog-Perl

(use_vars is default anyway thus drop it)

bin/FIJI/Netlist.pm

@@ -60,7 +60,7 @@ sub new {
         # options => $opt,
         # keep_comments => 1, # include comments in netlist
         link_read_nonfatal => 1,    # do not fail if module description not found
-        use_vars           => 1,
+        use_bitselects     => 1,
     );
     return $self;
 }