[FIX] stock: Preserve delivery slip description format

Steps to reproduce:
- Edit any product's 'Description for delivery orders' (inventory tab)
- Create a delivery for this product (or confirm sale order to create one automatically)
- Print delivery slip (Correct formatting)
- Validate delivery
- Print delivery slip once more (Description loses linebreaks)

This is only for looks, but it's a document the end user will see so there are concerns about it looking unprofessional.

This formatting error is due to us not being able to use a field element after remaking the order lines to group related products in python.

opw-4040127

closes odoo#174495

Signed-off-by: Adrien Widart (awt) <awt@odoo.com>

addons/stock/report/report_deliveryslip.xml

@@ -236,7 +236,7 @@
  <td>
  <span t-esc="aggregated_lines[line]['name']"/>
  <p t-if="aggregated_lines[line]['description']">
- <span t-esc="aggregated_lines[line]['description']"/>
+ <span t-esc="aggregated_lines[line]['description']" t-options="{'widget': 'text'}"/>
  </p>
  </td>
  <td class="text-center" name="move_line_aggregated_qty_ordered">