use as as_deref instead of as_ref and mapping on str

Reasons:
- Make the code more direct and concise.

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

src/account/command/sync.rs

@@ -95,7 +95,7 @@ impl AccountSyncCommand {
             None
         };
 
-        let account = self.account.name.as_ref().map(String::as_str);
+        let account = self.account.name.as_deref();
         let (toml_account_config, account_config) =
             config.clone().into_account_configs(account, true)?;
         let account_name = account_config.name.as_str();