feat: edit existing lesson

lms/www/batch/edit.py

@@ -9,6 +9,10 @@ def get_context(context):
 	chapter_index = frappe.form_dict.get("chapter")
 	lesson_index = frappe.form_dict.get("lesson")
 	lesson_number = f"{chapter_index}.{lesson_index}"
+	context.lesson_index = lesson_index
+	context.chapter = frappe.db.get_value(
+		"Chapter Reference", {"idx": chapter_index, "parent": context.course.name}, "chapter"
+	)
 	context.lesson = get_current_lesson_details(lesson_number, context, True)
 	context.is_moderator = has_course_moderator_role()
 	instructor = is_instructor(context.course.name)