Bug 23145: Confirming transfer during checkin clears the table of previously checked...

Bug 23145: Confirming transfer during checkin clears the table of previously checked-in items

This patch corrects the checkin template so that checking in an item
with an existing transfer does not clear the page of previous checkouts.

To test, apply the patch and check in some items.

 - After each checkin the returned item should appear in the table of
   checkouts.
 - Check in an item which belongs to another branch. You will be asked
   to confirm that the items requires a transfer. When the page reloads
   you should see the same previous checkins in the table.
 - Check in that same item again. You will be again asked to confirm.

   Before this page, confirming the transfer would reload the page and
   clear the list of checkins. Now the page should reload and the table
   of checkins should still show the previously checked-in items.

Test all the actions when checking in an item which is already in
transit: OK, Print transfer slip, and Cancel transfer.

Signed-off-by: George Williams <george@nekls.org>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
(cherry picked from commit 3cfd78788fe1bda05894a08c22f69ce1baa9482c)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>