Remove duplicate lines in MenuForm.php

I was reading the code for making draggable tables when I saw this...

    foreach (Element::children($links) as $id) {
      if (isset($links[$id]['#item'])) {
        $element = $links[$id];

        $form['links'][$id]['#item'] = $element['#item'];

        // TableDrag: Mark the table row as draggable.
        $form['links'][$id]['#attributes'] = $element['#attributes'];
        $form['links'][$id]['#attributes']['class'][] = 'draggable';

        $form['links'][$id]['#item'] = $element['#item'];

        // TableDrag: Sort the table row according to its existing/configured weight.
        $form['links'][$id]['#weight'] = $element['#item']->link->getWeight();

The line $form['links'][$id]['#item'] = $element['#item']; is duplicated.

Here's a simple patch who remove it.