Update for clippy 1.50 (#2193)

## Issue Addressed

NA

## Proposed Changes

Rust 1.50 has landed 🎉

The shiny new `clippy` peers down upon us mere mortals with disgust. Brutish peasants wrapping our `usize`s in superfluous `Option`s... tsk tsk.

I've performed the goat sacrifice and corrected our evil ways in this PR. Tonight we shall pray that Github Actions bestows the almighty green tick upon us.

## Additional Info

NA


Co-authored-by: realbigsean <seananderson33@gmail.com>
Co-authored-by: Michael Sproul <michael@sigmaprime.io>

account_manager/src/validator/create.rs

@@ -272,7 +272,7 @@ pub fn read_wallet_password_from_cli(
             .map_err(|e| format!("Unable to read {:?}: {:?}", path, e))
             .map(|bytes| strip_off_newlines(bytes).into()),
         None => {
-            eprintln!("");
+            eprintln!();
             eprintln!("{}", WALLET_PASSWORD_PROMPT);
             let password =
                 PlainText::from(read_password_from_user(stdin_inputs)?.as_ref().to_vec());