Function prompt_password_factor 

async fn prompt_password_factor(
    client: &BusClient,
    profile: &TrustProfileName,
    profile_name: &str,
    config_dir: &Path,
    salt: &[u8],
) -> Result<bool>

Prompt for password and submit as a factor. Returns Ok(true) if vault is unlocked, Ok(false) if partial.