Bug 13343: Embed items when send a basket/shelf

Bug 13343: Embed items when send a basket/shelf

When a basket/shelf is downloaded, items are embedded, but not when
sending it by email.

We would expect to get the same file.

Test plan:
On Opac and intranet:
1/ Add records with items to your basket and send it by email.
Verify the file contains items.
2/ Add records with items to a list and send it by email.
Verify the file contains items.

Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Mason James <mtj@kohaaloha.com>