badgeselector: Suppress badges that refer to deleted items

There is no point in allowing to select a badge that refers to a deleted
item as saving would result in the back-end triggering an item-not-found
error.

Bug: T76151

Change-Id: I0463ac65699803c81150b96d569f5775f1d685a0
Merge "badgeselector: Suppress badges that refer to deleted items"