Fix error and incorrect URLs in /api/v1/accounts/:id/featured_tags for remote accounts (#27459)

app/serializers/rest/featured_tag_serializer.rb

@@ -10,7 +10,9 @@ class REST::FeaturedTagSerializer < ActiveModel::Serializer
   end
 
   def url
-    short_account_tag_url(object.account, object.tag)
+    # The path is hardcoded because we have to deal with both local and
+    # remote users, which are different routes
+    account_with_domain_url(object.account, "tagged/#{object.tag.to_param}")
   end
 
   def name