Bug 20892: Correct basketgroup link in histsearch.pl

Bug 20892: Correct basketgroup link in histsearch.pl

When searching an order, histsearch.pl page, you see if exists the backetgroup as a link.
This link is composed of "basketgroup.pl?booksellerid=xxx", it must also contain "basketgroupid=xxx" and "opa=add".

See Bug 11429 for example.

Test plan :
1) Create an order in a basket and add it to a basketgroup
2) Search for this order, you get to page histsearch.pl
3) Check clicking on basketgroup id leads to basketgroup details page

Signed-off-by: Amit Gupta <amit.gupta@informaticsglobal.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>