FIX: Don't allow users to edit topic information when the OP is locked

see:
https://meta.discourse.org/t/user-able-to-edit-title-of-locked-post/104826

lib/guardian/topic_guardian.rb

@@ -97,7 +97,9 @@ module TopicGuardian
     )
 
     return false if topic.archived
-    is_my_own?(topic) && !topic.edit_time_limit_expired?
+    is_my_own?(topic) &&
+      !topic.edit_time_limit_expired? &&
+      !Post.where(topic_id: topic.id, post_number: 1).where.not(locked_by_id: nil).exists?
   end
 
   # Recovery Method