add index to choice URI to fix display order

tetras_extraction/script/src/extract_page.py

@@ -252,7 +252,7 @@ class ExerciceQC(Exercice):
     def save(self, graph: Graph):
         super().save(graph)
         for choice in self.choices.values():
-            choice_node = choice.save(graph, f"{self.id}_{choice.id}")
+            choice_node = choice.save(graph, f"{self.id}_{choice.index}_{choice.id}")
             graph.add((NS[self.id], NS["aReponse"], choice_node))
             # Our fake "class hierarchy" just for easier visualization
             graph.add((choice_node, RDFS.subClassOf, NS[self.id]))