Bug 27166: [20.05.x] Set destination_loc to item->homebranch

Bug 27166: [20.05.x] Set destination_loc to item->homebranch

In bug 21020 we used the issue to fetch the item and then the homebranch.
This fails when the item is not issued. We fetch the item already, so we
can use it directly

In 20.05.x we don't have the item object, so we can just use the SIP transaction item

To test:
1 - Have an item belonging to branch A
2 - Check it in via sip at branch B:
    perl misc/sip_cli_emulator.pl -a localhost -p 6001 -su term1 -sp term1 --item CHESS1 -l FPL -m checkin
3 - The read command is blank and there is a warn about uninitialized data
4 - Apply patch
5 - Restart sip server
6 - Check the item in at branch A using the sip cli emulator
7 - Check it in at branch B
8 - This time the checkin should succeed and the output msg should be included

Signed-off-by: Victor Grousset/tuxayo <victor@tuxayo.net>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Andrew Fuerste-Henry <andrew@bywatersolutions.com>