Bug 28745: (bug 28158 follow-up) Restore the items table once the job is done

Bug 28745: (bug 28158 follow-up) Restore the items table once the job is done

Caused by bug 28158, the batch item modifications tool does not longer
display the table with the items that have been modified on the result screen.

There is no more fork and so no more completedJobID var.
We must process the items THEN build the items' info.

Test plan:
Use the batch item modification tools to modify some items.
Confirm that with this patch the table with the modified items is
displayed on the last screen.

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>