Bug 25507: Fix table in basket group PDF German 2-pages

Bug 25507: Fix table in basket group PDF German 2-pages

A variable was doubled up which made the columns in the
table of orders no longer line up (different number of headers
to columns).

To test:
- Create at least one basket with one or more orders
- Close the basket
- Add the basket to a basket group manually or let Koha do it
  on closing
- Change the OrderPdfFormat system preference to 'German 2-page'
- Go to the basket group page and print the PDF of the basket
- Verify the table of orders doesn't look right and runs outside
  the page
- Apply patch
- Repeat the PDF print - now table should look right

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>