Make -nohidden position independent

Hello,

When I do:

```
bfs -nohidden . -name "*foo*"
```

it works great! Fast, and ignoring dirs starting with `.`, as expected.

But when I do:

```
bfs . -name "*foo*" -nohidden
```

the `-nohidden` switch is not effective.. I get search results from hidden dirs too (dirs starting with `.`)!
