remove empty str inside println

Reasons:
- Functionally it has the same result.

Signed-off-by: Perma Alesheikh <me@prma.dev>

src/smtp/wizard.rs

@@ -209,7 +209,7 @@ pub(crate) async fn configure(account_name: &str, email: &str) -> Result<Backend
             let (redirect_url, csrf_token) = auth_code_grant.get_redirect_url(&client);
 
             println!("{}", redirect_url.to_string());
-            println!("");
+            println!();
 
             let (access_token, refresh_token) = auth_code_grant
                 .wait_for_redirection(&client, csrf_token)