fix: don't return in /questions/unanswered reserved barcode by default

To be consistent with other /questions/* endpoints

robotoff/app/api.py

@@ -1173,6 +1173,9 @@ def on_get(self, req: falcon.Request, resp: falcon.Response):
         value_tag: str = req.get_param("value_tag")
         country: Optional[str] = req.get_param("country")
         server_domain: Optional[str] = req.get_param("server_domain")
+        reserved_barcode: Optional[bool] = req.get_param_as_bool(
+            "reserved_barcode", default=False
+        )
         campaign: Optional[str] = req.get_param("campaign")
 
         get_insights_ = functools.partial(
@@ -1184,6 +1187,7 @@ def on_get(self, req: falcon.Request, resp: falcon.Response):
             country=country,
             server_domain=server_domain,
             automatically_processable=False,
+            reserved_barcode=reserved_barcode,
             campaign=campaign,
         )