Fix clippy issues.

src/command/init/runner.rs

@@ -13,7 +13,7 @@ pub(crate) async fn init_natter_folder(args: InitArgs) -> Result<(), CustomError
 
     let mut existing_entries = tokio::fs::read_dir(&args.path).await?;
     let first_entry = existing_entries.next_entry().await?;
-    if let Some(_) = first_entry {
+    if first_entry.is_some() {
         return Err("The directory is not empty. Aborting.".into());
     }