Fixed jsCodeLocation init in demo app (#801)

Author: max-mironov

Examples/CodePushDemoApp/iOS/CodePushDemoApp/AppDelegate.m

@@ -20,7 +20,11 @@ - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(
   NSURL *jsCodeLocation;
 
 
-jsCodeLocation = [CodePush bundleURL];
+#ifdef DEBUG
+  jsCodeLocation = [[RCTBundleURLProvider sharedSettings] jsBundleURLForBundleRoot:@"index.ios" fallbackResource:nil];
+#else
+  jsCodeLocation = [CodePush bundleURL];
+#endif
 
   RCTRootView *rootView = [[RCTRootView alloc] initWithBundleURL:jsCodeLocation
                                                       moduleName:@"CodePushDemoApp"