Rewrite imports in RNTester to use standard paths (#24317)

Summary:
See https://github.com/facebook/react-native/issues/24316 for the motivation. This commit rewrites the imports in the RNTester project.

[General] [Changed] - Replaced Haste-style imports with standard path-style imports for RNTester
Pull Request resolved: https://github.com/facebook/react-native/pull/24317

Differential Revision: D14870504

Pulled By: cpojer

fbshipit-source-id: b14f22e7ce559efc332ced032617ca581196d90f

RNTester/js/ToolbarAndroidExample.android.js

@@ -11,16 +11,19 @@
 'use strict';
 
 const React = require('react');
-const ReactNative = require('react-native');
+const {
+  StyleSheet,
+  Switch,
+  Text,
+  ToolbarAndroid,
+  View,
+} = require('react-native');
+
+const nativeImageSource = require('../../Libraries/Image/nativeImageSource');
 
-const nativeImageSource = require('nativeImageSource');
-const {StyleSheet, Text, View} = ReactNative;
 const RNTesterBlock = require('./RNTesterBlock');
 const RNTesterPage = require('./RNTesterPage');
 
-const Switch = require('Switch');
-const ToolbarAndroid = require('ToolbarAndroid');
-
 class ToolbarAndroidExample extends React.Component<{}, $FlowFixMeState> {
   state = {
     actionText: 'Example app with toolbar component',