Bug 29002: Ensure bookings stash is up to date

Bug 29002: Ensure bookings stash is up to date

This patch adds the edited/added booking to the bookings stash such that
subsequent triggers of the place/edit booking modal will reflect the
change in thier picker.

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Janet McGowan <janet.mcgowan@ptfs-europe.com>
Signed-off-by: Caroline Cyr La Rose <caroline.cyr-la-rose@inlibro.com>
Signed-off-by: Laurence Rault <laurence.rault@biblibre.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>