fix type in default property

Signed-off-by: David Hontecillas <dhontecillas@gmail.com>

Author: dhontecillas

v2.13/backend/pubsub/kafka/publisher.json

@@ -9,7 +9,7 @@
     "success_status_code": {
       "title": "Success Status Code",
       "description": "HTTP status code to return for a successful write in the queue",
-      "x-deafult": 200,
+      "default": 200,
       "type": "number",
       "maximum": 201,
       "minimum": 200

v2.13/krakend.json

@@ -1820,7 +1820,7 @@
         "success_status_code": {
           "title": "Success Status Code",
           "description": "HTTP status code to return for a successful write in the queue",
-          "x-deafult": 200,
+          "default": 200,
           "type": "number",
           "maximum": 201,
           "minimum": 200