LP1888723 Holdings refresh handles deleted call numbers

LP1888723 Holdings refresh handles deleted call numbers

Teach the holdings grid in the staff catalog to correctly remove deleted
volumes from its tree when holding are modified in another tab.

To test, in the holding editor, modify a call number to have the same
label as another call number with the same owning org unit and save.  On
the backend, this will result in one of the call numbers getting
deleted.  Confirm the deleted call number no longer appears in the
holdings grid.

Signed-off-by: Bill Erickson <berickxx@gmail.com>