CACE can't find the schematic netlist when using local_netlist_dir in xschemrc

When you have the following line in your xschemrc:

```tcl
set local_netlist_dir 1
```

xschem will write the netlist under `xschem/simulation` instead of under `netlist/schematic` where CACE expects to find it. 

A possible workaround would be to set local_netlist_dir to 0 before exporting the netlist, so CACE works correctly whether `local_netlist_dir` is set or not in xschemrc.