Do not require disabled exercises in unlocks

Author: nygrenh

app/models/unlock_spec.rb

@@ -152,7 +152,8 @@ def check_group_or_exercise_exists(course, group_or_exercise_name)
   end
 
   def available_and_awarded(course, group_or_exercise_name, user)
-    required_exercises = course.exercises_by_name_or_group(group_or_exercise_name).select { |e| e.hide_submission_results == false }
+    required_exercises = course.exercises_by_name_or_group(group_or_exercise_name)
+                               .select { |e| e.hide_submission_results == false && e.enabled? }
     available = AvailablePoint.course_points_of_exercises_list(course, required_exercises)
       .map(&:name)
     awarded = AwardedPoint.course_user_points(course, user)