Update sample app to support right-to-left layouts

Bug: 18262639
Change-Id: I2c1136821f665db095d72cee74f4c404badf4461
diff --git a/samples/SupportLeanbackDemos/AndroidManifest.xml b/samples/SupportLeanbackDemos/AndroidManifest.xml
index 68016c5..e9fc37c 100644
--- a/samples/SupportLeanbackDemos/AndroidManifest.xml
+++ b/samples/SupportLeanbackDemos/AndroidManifest.xml
@@ -10,6 +10,7 @@
         android:label="@string/app_name"
         android:icon="@drawable/ic_launcher"
         android:banner="@drawable/ic_launcher"
+        android:supportsRtl="true"
         android:theme="@style/Theme.Example.Leanback">
 
         <activity android:name="MainActivity"