Bugfest. Green success toast is missing when saving a holdings

Overview: When testing T664415 is was noticed that a green success toast is missing when saving a new holdings record, or updating an existing holdings record. This was found in https://bugfest-iris.folio.ebsco.com/, and also in the FOLIO Snapshot environment.

Steps to Reproduce:

1. Log into FOLIO snapshot as diku_admin
2. Go to Inventory, and find any instance record
3. Create a new holdings record
4. Click Save and close

Expected Results: The record is saved and a green success toast will display saying: The holdings - HRID [the HRID number] has been successfully saved."

Actual Results: The record is saved but no green success toast is showing.

Additional Information: This bug was found when testing T664415 in Bugfest Iris. Similar when doing an update of an existing holdings record, then the green success toast is also missing.

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