add/change .neo-express contents

[ixje]

The .neo-express file has among other stuff data on wallet accounts.

• One item I'd love to see added is the public key of the account.
• This one is a bit nitpicking but the script-hash key is actually the account address (a base58check encoded script hash). I think we should either change it to address or fix it to be the actual script-hash because the value would be invalid for anything called script hash on docs.neo.org and that might light to confusing among users.