Bug 7758 - Koha allowing LOST items to check out without alert

Bug 7758 - Koha allowing LOST items to check out without alert

Adds a confirmation alert when issuing an item that has
been marked as lost.

Signed-off-by: Liz Rea <wizzyrea@gmail.com>
passes tests, works as advertiesd

Tested:
- checking out an item that is marked lost performs all usual lost operations
- checking out an item that is marked lost prompts for confirmation

Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>
Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>