Bug 31056: Restore closeandprint function on basketgroups page

Bug 31056: Restore closeandprint function on basketgroups page

Bug 13614 removed the basketgroup.js asset from the basket group
page. This file includes the closeandprint function used for
closing and printing the PDF from the open basket groups tab.
The patch restores just this function directly in the file where
it's needed as this is the only spot and it's only a few lines.
The rest of basketgroup.js appears unused.

To test:
* Create a basket with one or more oder lines
* Close the basket and check the checkbox to add it to a
  basket group
* Reopen the basket group from the basket groups page
* Verify the close and print only leads to a JS error and
  nothing happens
* Apply patch
* Repeat and verify you can now 'Close and print' from the
  open basket group tab
* Verify all other buttons work as expected as well

Signed-off-by: Caroline Cyr La Rose <caroline.cyr-la-rose@inlibro.com>
JD Amended patch: fix indentation and spacing

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>