Bug 27855: (QA follow-up) Rename extended_attribute to patron_extended_attribute

This path renames the extended_attribute definition to
patron_extended_attribute to clarify that these attributes are always
attached to a patron and not a more generic class of attributes.

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>

api/v1/swagger/definitions/patron.json

@@ -286,7 +286,7 @@
       "type": "array",
       "description": "patron's extended attributes",
       "items": {
-        "$ref": "extended_attribute.json"
+        "$ref": "patron_extended_attribute.json"
       }
     }
   },