Fix error when rendering actor with hashtags in bio (#16218)

Fix #16217, regression from #16160

app/serializers/activitypub/actor_serializer.rb

@@ -177,7 +177,7 @@ class ActivityPub::ActorSerializer < ActivityPub::Serializer
     end
 
     def href
-      explore_hashtag_url(object)
+      tag_url(object)
     end
 
     def name