BUGFIX: trust_level_0 group not including trust_level_1

BUGFIX: manual trust level change not adding user to groups
BUGFIX: system not in correct trust level groups

app/controllers/admin/users_controller.rb

@@ -1,6 +1,5 @@
 require_dependency 'user_destroyer'
 require_dependency 'admin_user_index_query'
-require_dependency 'boost_trust_level'
 
 class Admin::UsersController < Admin::AdminController
 
@@ -111,8 +110,9 @@ class Admin::UsersController < Admin::AdminController
 
   def trust_level
     guardian.ensure_can_change_trust_level!(@user)
-    logger = StaffActionLogger.new(current_user)
-    BoostTrustLevel.new(user: @user, level: params[:level], logger: logger).save!
+    level = TrustLevel.levels[params[:level].to_i]
+    @user.change_trust_level!(level, log_action_for: current_user)
+
     render_serialized(@user, AdminUserSerializer)
   end