Use MANAGE_ROLLBACKS permission in SampleRollbackApp.

Bug: 220204580
Test: manual
Change-Id: Iac272b7b490e29fda8f715200439c4069ad98aee

tests/RollbackTest/SampleRollbackApp/AndroidManifest.xml

@@ -16,7 +16,7 @@
   -->
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
           package="com.android.sample.rollbackapp" >
-    <uses-permission android:name="android.permission.TEST_MANAGE_ROLLBACKS" />
+    <uses-permission android:name="android.permission.MANAGE_ROLLBACKS" />
     <application
         android:label="@string/title_activity_main">
         <activity
@@ -28,4 +28,4 @@
             </intent-filter>
         </activity>
     </application>
-</manifest>
+</manifest>