update front end certification guide handle action in the store solution code to return the state parameter not the defaultState object (#28485)

guide/english/certifications/front-end-libraries/redux/handle-an-action-in-the-store/index.md

@@ -20,7 +20,7 @@ const reducer = (state = defaultState, action) => {
     login: true
     } 
     } else {
-      return defaultState
+      return state
   };
   // change code above this line
 };