routes.aardbei: Fix crash in aardbei_apply

piket_server/routes/aardbei.py

         {
             "num_changes": link.num_changes,
             "new_people": [member.person.full_name for member in link.remote_only],
-            "link_existing": [match.local.name for match in link.matches],
-            "altered_name": [match.local.name for match in link.matches],
+            "link_existing": [match.local.full_name for match in link.matches],
+            "altered_name": [match.local.full_name for match in link.altered_name],
         },
         200,
     )