fix: initalise sucess var before its used

[distributedstatemachine]

POW registrations fail because we dont initialise success before we use it.

                            │ │
│ │                wallet = name: 'default', hotkey: 'foo', path: '~//home/ubuntu/.bittensor/wallets/'    │ │
│ ╰───────────────────────────────────────────────────────────────────────────────────────────────────────╯ │
╰───────────────────────────────────────────────────────────────────────────────────────────────────────────╯
UnboundLocalError: local variable 'success' referenced before assignment

[thewhaleking]

This is already fixed in staging #189