Fix nuxeo-selectivity displaying entry id when refreshed in Saved Search

Steps to Reproduce:

1. In Web UI, navigate to a Drawer Item-based search whose form contains a nuxeo-selectivity or input widget using it (e.g. either nuxeo-user-suggestion or nuxeo-directory-suggestion). 
   In vanilla Web UI: see "Collections" input in Default Search form
2. Populate one or several of these widgets with values. Observe that their labels are shown (as expected).
3. After running the search, use the Save As button at the top-right to save the search with the selected values.
4. Reload the browser, navigate back to the search and user the "SEARCH FILTERS" dropdown at the top to select the search saved in step 3.

Expected result: entries previously selected in input widgets display labels.

Actual result:
LTS 2019: values previously selected in input widgets display their IDs
LTS 2021: after Step 3, the UIDs are briefly visible before updating to display the entry titles. Following this, titles are visible per expected behavior.