Fix UserManagement permissions issue.

solidusio@01a8872
introduced a bug whereby admins with the UserManagement permission (but
no SuperUser permission) lost the ability to view the orders, addresses,
and items tabs in user admin. This code puts back that ability.

core/lib/spree/permission_sets/user_management.rb

@@ -2,7 +2,7 @@ module Spree
   module PermissionSets
     class UserManagement < PermissionSets::Base
       def activate!
-        can [:admin, :display, :create, :update, :save_in_address_book, :remove_from_address_book], Spree.user_class
+        can [:admin, :display, :create, :update, :save_in_address_book, :remove_from_address_book, :addresses, :orders, :items], Spree.user_class
 
         # due to how cancancan filters by associations,
         # we have to define this twice, once for `accessible_by`