FIX: Delete topic timer after completion.

spec/integration/topic_auto_close_spec.rb

@@ -79,9 +79,11 @@ describe Topic do
           context 'topic is closed manually' do
             it 'should remove the schedule to auto-close the topic' do
               Timecop.freeze do
+                topic_timer_id = staff_topic.topic_timer.id
+
                 staff_topic.update_status('closed', true, admin)
 
-                expect(staff_topic.topic_status_update.reload.deleted_at)
+                expect(TopicTimer.with_deleted.find(topic_timer_id).deleted_at)
                   .to be_within(1.second).of(Time.zone.now)
               end
             end