Bug 31459: (follow-up) Return 'Keep current' option

Bug 31459: (follow-up) Return 'Keep current' option

This patch restores the option to keep current budget, in the case that receiver can receive, but cannot order on current budget

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
https://bugs.koha-community.org/show_bug.cgi?id=31559
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
(cherry picked from commit b86e5b542378c19ec8675a9beeb8d856c9b057c8)

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
(cherry picked from commit c005ef2108f06146995b507f682c09ba2c3b30e8)
Signed-off-by: Arthur Suzuki <arthur.suzuki@biblibre.com>