query_vars_changed & query_vars_hash are private

```
if ( $hash != $this->query_vars_hash ) {
            $this->query_vars_changed = true;
            $this->query_vars_hash = $hash;
        }
```

In class-es-wp-query-wrapper.php probably won't work as intended since they are set as private in the WP_Query class. This _probably_ doesn't change anything but maybe just removing that code would be best.
