fix response template

Author: horike37

lib/deploy/events/apiGateway/methods.js

@@ -112,13 +112,13 @@ module.exports = {
       IntegrationResponses: [
         {
           StatusCode: 200,
-          SelectionPattern: '',
+          SelectionPattern: 200,
           ResponseParameters: {},
           ResponseTemplates: {},
         },
         {
           StatusCode: 400,
-          SelectionPattern: '[\\s\\S]*\\[400\\][\\s\\S]*',
+          SelectionPattern: 400,
           ResponseParameters: {},
           ResponseTemplates: {},
         },