Bug 33412: Fix comparison when checking for overlay framework

Bug 33412: Fix comparison when checking for overlay framework

TO test:
 1 - Cataloging -> Export catalog data
 2 - Export a record fom your catalog
 3 - Cataloging -> Stage record for import
 4 - Import the record, use Record matchign rule: KohaBiblio (999c)
 5 - Stage, view batch
 6 - Record should match the one that was exported
 7 - When replacing record use this framework, choose a different value than current framework of record
 8 - Import this batch
 9 - View and edit record - note framework did not change
10 - Apply patch
11 - Restart all
12 - Repeat 4-8
13 - View and edit record, confirm framework has changed
14 - Sign off

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>