Fix android sample buck build

Summary:
This was removed because it's implicitly required by the library now.
However, Buck doesn't pick this up by default and requires further
configuration. It's easiest just to declare this twice now.

Reviewed By: jknoxville

Differential Revision: D18202459

fbshipit-source-id: 48c6a91c2fca0d932950a81c092b78b90a24c27b

android/sample/AndroidManifest.xml

@@ -9,6 +9,7 @@
 
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
           package="com.facebook.flipper.sample">
+  <uses-permission android:name="android.permission.INTERNET" />
   <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
 
   <application