Bug 35248: Drop ->place_booking

Bug 35248: Drop ->place_booking

These methods were introduced and used in an earlier iteration of the
code, they are no longer called from anywhere (the code in
Koha::Booking->store handles all cases instead) and thus I choose to
remove them rather than add unit tests for them.. They are simple
methods that could be re-introduced as required at a future date.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>