Bug 8575: Expected items count should not include cancelled orders

Bug 8575: Expected items count should not include cancelled orders

To test:
  1/ create a new basket with 2 orders, one with 1 item, another with 2
     items
  2/ look at booksellers.pl page, you should see that 3 items are
     expected
  3/ cancel the order with 1 item
  4/ refresh booksellers.pl page, it should remains 2 expected items

Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz>
Works exactly as designed

Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>