tests/publish: Fix broken assertion (#6796)

Merging without a rebase in between... always fun... thank you to CI for catching this! 😅

Author: Turbo87

src/tests/http-data/krate_publish_new_krate_with_empty_readme.json

@@ -661,8 +661,11 @@ fn new_krate_with_empty_readme() {
     assert_eq!(json.krate.name, "foo_readme");
     assert_eq!(json.krate.max_version, "1.0.0");
 
-    let files = app.stored_files();
-    assert_eq!(files, vec!["crates/foo_readme/foo_readme-1.0.0.crate"]);
+    let expected_files = vec![
+        "crates/foo_readme/foo_readme-1.0.0.crate",
+        "index/fo/o_/foo_readme",
+    ];
+    assert_eq!(app.stored_files(), expected_files);
 }
 
 #[test]