Bug 15478 - Checksum mismatch when regenerating schema

 Bug 15478 - Checksum mismatch when regenerating schema

When regenerating the db schema on master, the script will error out
with a checksum mismatch on Borrower.pm, and also DeletedBorrower.pm

Test Plan:
1) Check out master
2) Run ./misc/devel/update_dbix_class_files.pl
3) Note the error
4) Apply this patch
5) Re-reun ./misc/devel/update_dbix_class_files.pl
6) Note there is no error

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Brendan A Gallagher <brendan@bywatersolutions.com>