Bug 31826: Add page-section to item form on order receive page (acq)

Bug 31826: Add page-section to item form on order receive page (acq)

This patch adds a "page-section" class to the container div around the
items table on the order receive page in acquisitions.

To test, apply the patch and go to Acquisitions.

- Locate a vendor and few its details.
- Click "Receive shipments."
- Fill out the "Receive shipment" form if you have no existing
  shipments. Otherwise click on the invoice number link to get to the
  "Receive orders" page.
- In the table of pending orders, click a "Receive" link.
- On the "Receive items" page there should be three sections: Catalog
  details, Acquisitions details, and Items.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>