Bug 20728: Replace the calls by their Koha::Acq::Orders->search equivalent

Bug 20728: Replace the calls by their Koha::Acq::Orders->search equivalent

There are 2 subroutines from C4::Acquisition that could be removed:
- GetLastOrderReceivedFromSubscriptionid
- GetLastOrderNotReceivedFromSubscriptionid

After bug 20726 only GetLastOrderReceivedFromSubscriptionid will be used
(from acqui/neworderempty.pl) and this call could be replaced easily with Koha::Acquisition::Orders

The code (+ tests) related to these 2 subroutines could then be removed.

The parameters for the search is basic and does no really deserve its own subroutine.

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