unpack/unpack-dir are broken

I try to exclude `node_modules/electron` from the asar using this command, which I think, should do exactly this:

```
npx asar pack . app.asar --unpack-dir "node_modules/electron"
```

Now, when we look into the `asar.app.unpacked` folder, we find the files for `node_modules/electron` and also all files for all libraries like `node_modules/electron*` - for example, `node_modules/electron-redux`.

Then, when we do `npx list app.asar`, we see that `node_modules/electron` is still packaged (and the others also).

I expect, from the documentation, that it would just exclude that folder and not all, that simply start with the pattern, as that's what it says on the readme. And then, it actually does not exclude.