Bug 27896: Remove DeleteTransfer from circ/return.pl

Bug 27896: Remove DeleteTransfer from circ/return.pl

This patch replaces the DeleteTransfer call in circ/returns.pl with a
call to Koha::Item::Transfer->cancel.

Test plan
1/ Check an item out
2/ Add a transfer request for the item to a second library
3/ Attempt to check the item in at the first library
4/ Note that you should be given a 'WrongTransfer' modal and have to
option to cancel.
5/ Cancel the transfer
6/ Check in the database that the transfer now has 'datecancelled' set.
7/ Add a transfer for the item again
8/ From the transferstoreceive page cancel the transfer
9/ Click cancel and again check that datecancelled is set in the
database for your transfer

Signed-off-by: Petro Vashchuk <stalkernoid@gmail.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Bug 27896: (follow-up) Fix Typo

Signed-off-by: Petro Vashchuk <stalkernoid@gmail.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>