Bug 31587: Basket not accessible from ACQORDER notice

Bug 31587: Basket not accessible from ACQORDER notice

The parameter "aqbasket" is passed to GetPreparedLetter, but is always undefined for the notice ACQORDER.

Test Plan:
1) Set your ACQORDER notice content to:
   ***[% basket %]***
2) Set up a vendor with an email, set contact for email so the "E-mail
   order" button shows on a basket for that vendor
3) E-mail the basket
4) Note the email contents are "******"
5) Apply this patch
6) Restart all the things!
7) Email the basket again
8) Note the content looks something like:
   ***Koha::Acquisition::Basket=HASH(0x55870acd96e0)***

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