Bug 30525: Items batch modification broken

Bug 30525: Items batch modification broken

This patch modifies instances in the code which try to get cookies
using:

my %cookies = parse CGI::Cookie($cookie);

In some cases the relevant lines can be removed because they are unused.
In others it can be replaced with:

my %cookies = CGI::Cookie->fetch();

To test, apply the patch and restart_all. Test the following pages to
confirm they load without errors:

- Circulation -> Offline circulation file upload
- Circulation -> Offline circulation -> Add to queue

- Tools -> Batch item modification
- Tools -> Stage MARC for import
- Tools -> Staged MARC management
- Tools -> Batch patron modification
- Tools -> Upload local cover image

Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>