remove constructors per review

app/src/page/firstRun/internal/email-collect-page.js

@@ -16,15 +16,12 @@ import firstRunStyle from '../../../styles/firstRun';
 class EmailCollectPage extends React.PureComponent {
   static MAX_STATUS_TRIES = 15;
 
-  constructor() {
-    super();
-    this.state = {
-      email: null,
-      authenticationStarted: false,
-      authenticationFailed: false,
-      statusTries: 0
-    };
-  }
+  state = {
+    email: null,
+    authenticationStarted: false,
+    authenticationFailed: false,
+    statusTries: 0
+  };
 
   componentWillReceiveProps(nextProps) {
     const { authenticating, authToken } = this.props;

app/src/page/firstRun/view.js

@@ -22,16 +22,13 @@ class FirstRunScreen extends React.PureComponent {
     'email-collect'
   ];
 
-  constructor() {
-    super();
-    this.state = {
-      currentPage: null,
-      emailSubmitted: false,
-      isFirstRun: false,
-      launchUrl: null,
-      showBottomContainer: true
-    };
-  }
+  state = {
+    currentPage: null,
+    emailSubmitted: false,
+    isFirstRun: false,
+    launchUrl: null,
+    showBottomContainer: true
+  };
 
   componentDidMount() {
     Linking.getInitialURL().then((url) => {