Make all Ubercart products shippable

fix.php

<?php

/**
 * Implements hook_cart_item().
 *
 * Make sure all products are shippable.
 * Fix Card #6: Shipping issue with multiple products.
 */
function ss_cart_item($op, &$item) {
  switch ($op) {
    case 'load':
      $item->data['shippable'] = 1;
      break;
  }
}