Fix snapshot middleware clippy lints (#686)

The seventh in a series of PRs that aim to get CI passing

src/snapshot_middleware/dir.rs

@@ -77,7 +77,7 @@ pub fn snapshot_dir_no_meta(
 
     let relevant_paths = vec![
         path.to_path_buf(),
-        meta_path.clone(),
+        meta_path,
         // TODO: We shouldn't need to know about Lua existing in this
         // middleware. Should we figure out a way for that function to add
         // relevant paths to this middleware?