Bug 36946: Fix cud- error when processing offline circulations

This patch fixes a CSRF token error when processing offline
circulations. The form needed both the token parameter and to be sent as
POST.

To test, apply the patch and go to Circulation.

- Go to Upload offline circulation file (.koc)
- Upload a .koc file, add to offline circulation queue.
- View pending offline circulation actions.
- Check one or more transactions and click "Process" at the bottom of
  the page.
  - The process should complete without any JS errors, and the
    checkboxes should be replaced with the text "Success."
- Perform the same test with the "Delete" button.

Sponsored-By: Athens County Public Libraries
Signed-off-by: David Nind <david@davidnind.com>

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>

koha-tmpl/intranet-tmpl/prog/en/modules/offline_circ/list.tt

@@ -137,9 +137,14 @@
                     var cb = $(this);
                     $.ajax({
                         url: "process.pl",
-                        data: { 'op': 'cud-' + op, 'operationid': this.value },
+                        data: {
+                            'op': 'cud-' + op,
+                            'operationid': this.value,
+                            'csrf_token': $('meta[name="csrf-token"]').attr('content')
+                        },
                         async: false,
                         dataType: "text",
+                        type: "POST",
                         success: function(data) {
                             if( data == "Added." ){
                                 cb.replaceWith(_("Added."));