Bug 32321: Pre-populate material type for 006 in advanced cataloging editor

Bug 32321: Pre-populate material type for 006 in advanced cataloging editor

To test"
1 - Edit a record in advanced cataloging editor with field helpers enabled
2 - Choose a material type, not BKS, from dropdown
3 - Set the first position to something
4 - Save the record
5 - 006 shows 'BKS'
6 - Apply patch
7 - Reload
8 - Record should show correct value
9 - Edit 006 and confirm the first position correctly determines material type

Signed-off-by: Andrew Fuerste-Henry <andrewfh@dubcolib.org>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>