Bug 24951: Add id to payout modal confirm button

Bug 24951: Add id to payout modal confirm button

This patch adds an ID to the payout confirmation modal on the
borrower account details page.

Test plan:
1/ Apply patch
2/ Attempt to issue a payout to a patron
3/ Inspect the page and note the presence of an ID for the confirm
   button
4/ Signoff

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>