lp1821950 Require Call Number Label YAOUS

lp1821950 Require Call Number Label YAOUS

- Add YAOUS to Require Call Number Labels in Copy Editor
- Set new YAOUS to true
- Don't display empty call number field warning if call numbers
aren't required on the copy editor.
- Properly enable/disable saving an item in the volcopy editor when
CN label is empty, based on Require Call Number Label setting.

Signed-off-by: Kyle Huckins <khuckins@catalyte.io>
 Changes to be committed:
	modified:   Open-ILS/src/sql/Pg/950.data.seed-values.sql
	new file:   Open-ILS/src/sql/Pg/upgrade/XXXX.lp1821950-call-number-label-required-yaous.sql
	modified:   Open-ILS/web/js/ui/default/staff/cat/volcopy/app.js