Admin UI should refresh after editing security

Solr Admin UI reads a list of user's roles and permissions from the /admin/info/system endpoint, and then use it to enable/disable various UI menus and buttons based on permissions.

If a user with security-edit permission, uses the UI to edit permissions, then Admin UI won't refresh its cached version of current user's roles and permissions before you manually reload the page.

Probably not a big deal, as users with security-edit probably have full access anyway, but just a small inconsistency I noticed.