Double encoding for the network name in the `ursula stake --list` output

Seen in: commit 52420e071fdf9b3dc232585fe536d26e57e7c11a (current `hawksbeard` branch)

    $ nucypher ursula stake --list
    ...
    Enter keyring password: 
    Decrypting NuCypher keyring...
    Decrypting Ethereum Node Keyring...
    No default teacher nodes exist for the specified network: b"b'goerli'"
    ...