[Improvement] Empty password protection

[AdamB2023]

When reading WH users messages, I noticed that some of them are not using a password to protect their private key.
We know that everyone should take own responsibility for security, however the code itself could help in such case.
This will especially benefit not only the users security, but also in case of breach will prevent making a bad image about WalletHunter.

Please implement a hardcoded password which would encrypt the config for people who aren't using any password.