Fix NoMethodError in ActivityPub::NoteSerializer (mastodon#10172)

Author: Gargron

app/serializers/activitypub/note_serializer.rb

@@ -122,7 +122,7 @@ def local?
   end
 
   def poll_options
-    if !object.expired? && object.hide_totals?
+    if !object.poll.expired? && object.poll.hide_totals?
       object.poll.unloaded_options
     else
       object.poll.loaded_options