Bug 21584: Wrong offset type for Lost Item

Bug 21584: Wrong offset type for Lost Item

Bug 2696 introduced account_offset_type.inc but 'Lost Item Return' doesn't match what is added on the database. Moreover, bug 20978 added references to this wrong value too in Koha::Account

This patch performs a trivial fix for this.

Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Patch matches what was outlined in test plan, also passes qa test tool

Signed-off-by: Alex Buckley <alexbuckley@catalyst.net.nz>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>