FIX: Disallow featuring hidden topics (#8814)

lib/guardian/user_guardian.rb

@@ -127,6 +127,7 @@ module UserGuardian
   def can_feature_topic?(user, topic)
     return false if !SiteSetting.allow_featured_topic_on_user_profiles?
     return false if !is_me?(user) && !is_staff?
+    return false if !topic.visible
     return false if topic.read_restricted_category? || topic.private_message?
     true
   end