includes speakers to prevent n+1 in schedules#show (#596)

Author: adrienpoly

app/controllers/events/schedules_controller.rb

@@ -34,6 +34,6 @@ def set_talks(day)
     talk_count = @event.schedule.talk_offsets[index]
     talk_offset = @event.schedule.talk_offsets.first(index).sum
 
-    @talks = @event.talks_in_running_order(child_talks: false).to_a.from(talk_offset).first(talk_count)
+    @talks = @event.talks_in_running_order(child_talks: false).includes(:speakers).to_a.from(talk_offset).first(talk_count)
   end
 end