Remove some unneccesary checks for teacher status in courses

aleksis/apps/alsijil/util/predicates.py

@@ -310,11 +310,10 @@ def is_course_teacher(user: User, obj: Course):
 def is_lesson_event_teacher(user: User, obj: LessonEvent):
     """Predicate for teachers of a lesson event.
 
-    Checks whether the person linked to the user is a teacher in the lesson event,
-    or a teacher of the course, if the lesson event has one.
+    Checks whether the person linked to the user is a teacher in the lesson event.
     """
     if obj:
-        return obj.course and is_course_teacher(user, obj.course) or user.person in obj.all_teachers
+        return user.person in obj.all_teachers
     return False
 
 
@@ -419,8 +418,6 @@ def can_edit_documentation(user: User, obj: Documentation):
             return is_lesson_event_teacher(user, obj.lesson_event) | is_lesson_event_group_owner(
                 user, obj.lesson_event
             )
-        if obj.course:
-            return is_course_teacher(user, obj.course)
     return False