Add "All" Option Back to the Site Filter Within the "Users with Extensions" Page in Service Web

The customer would like to be able to filter by "All" sites within the Sites filter in the "Users with Extensions" page in Service Web. For example, when trying to filter for users who are in a Not Activated status, customers were previously able to select "All" sites and then deselect sites they know to have no inactive users. Customers with a large amount of sites would greatly benefit from this filter option rather than having to manually select sites individually.