Update the mobx state example per SME Matias (#54)

Author: slemmon

24-mobx-state/a-application-state-mobx/src/Form.js

@@ -6,7 +6,7 @@ import UserStore from './UserStore';
 @inject(({ store }, { user }) => {
   return {
     store,
-    user: user || (store && store.user)
+    user
   };
 })
 @observer
@@ -16,15 +16,8 @@ class Form extends Component {
     @observable user: {}
   }
 
-  @action
-  componentDidMount() {
-    const { store, user } = this.props;
-    
-    store.user = user;
-  }
-
   render() {
-    const { user } = this.props.store;
+    const { user } = this.props;
     const { renderField, submit } = this;
 
     return (
@@ -67,10 +60,10 @@ class Form extends Component {
 
   @action.bound
   handleFieldChange(e) {
-    const { onChange, store } = this.props;
+    const { onChange, user } = this.props;
     const { name, value } = e.target;
 
-    store.user[name] = value;
+    user[name] = value;
 
     if (onChange) {
       onChange({ [name]: value });
@@ -81,7 +74,7 @@ class Form extends Component {
     e.preventDefault();
 
     // do submit
-  };
+  }
 }
 
-export default Form;
+export default Form;