BUG: Need correct output-descriptor when --full-address-derivation-path is set

```
/usr/local/bin/keytool --seed MYSEED --full-address-derivation-path m//48h/0h/0h/2h output-descriptor
```
results in
````
wpkh([feebfc32/84h/0h/0h]xpubWRONGXPUB)
````

What I want is
```
wpkh([feebfc32/84h/0h/0h]xpubCORRECTXPUB)
```

Reproduce the shown keytool command and trace how --full-address-derivation-path is handled when output-descriptor is requested. Compare the derivation path used for the displayed xpub with the requested path; done means the command emits the expected descriptor and the behavior is covered by a regression test.

Escrito por el modelo de indexación a partir del texto del issue.