"Search for Groups" input field in Admin WebUI retains its value after use

When assigning Groups to a User in WebUI, the dropdown field to "Search for Groups" will retain the last value selected after being used, and show this value upon next use for a different User.

Steps to reproduce:

• Admin WebUI, "User & Groups" tab, search for a User (e.g. UserA) and select it
• click the " Add To Group" button, and search-for and select any Group
• the Group is assigned to UserA
• return to Admin home, re-open "User & Group" tab
• search for any other user (e..g UserB) and select it
• click the " Add To Group" button
• Observe: the previously selected Group from UserA is shown before searching for any Group
• Expected: the drop down should be blank allowing for a new search