Fixed destroy_repeated submissions task

lib/tasks/submission.rake

@@ -19,9 +19,9 @@ namespace :submission do
       subs = Submission.where(learning_object_id: id).limit(lo_hash[id] - 1)
       subs.each do |i|
         assignments = i.curator_assignments.pluck(:id)
-        actvities = PublicActivity::Activity.where(trackable_id: assignments, trackable_type: "CuratorAssignment")
-        i.destroy
+        activities = PublicActivity::Activity.where(trackable_id: assignments, trackable_type: "CuratorAssignment")
         activities.destroy_all
+        i.destroy
       end
     end
   end