clean up database file after testing (#5087)

Co-authored-by: Matthias Seitz <matthias.seitz@outlook.de>
Co-authored-by: joshieDo <93316087+joshieDo@users.noreply.github.com>

crates/storage/db/benches/utils.rs

@@ -72,5 +72,5 @@ where
         tx.inner.commit().unwrap();
     }
 
-    db
+    db.into_inner_db()
 }