message: Update execution_engine/src/storage/trie_store/lmdb.rs
diff: //! let tmp_dir = tempdir().unwrap();
  //! let map_size = 4096 * 2560; // map size should be a multiple of OS page size
  //! let max_readers = 512;
  -//! let env = LmdbEnvironment::new(&tmp_dir.path().to_path_buf(), map_size, max_readers, true, 2).unwrap();
  +//! let env = LmdbEnvironment::new(&tmp_dir.path().to_path_buf(), map_size, max_readers, true).unwrap();
  //! let store = LmdbTrieStore::new(&env, None, DatabaseFlags::empty()).unwrap();
  //!
  //! // First let's create a read-write transaction, persist the values, but
  