Start PowerUsageDetails fragment in the correct activity

Make sure the stack does not get corrupted by running a fragment as a
managed profile in an activity that runs as primary profile.

Bug:17523189

Change-Id: I7a066a411c7995ffe44b73c6dc27b24eec85b5b3

src/com/android/settings/Utils.java

@@ -613,6 +613,8 @@ public final class Utils {
             int titleResId, CharSequence title, boolean isShortcut, UserHandle userHandle) {
         Intent intent = onBuildStartFragmentIntent(context, fragmentName, args, titleResId,
                 title, isShortcut);
+        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
         context.startActivityAsUser(intent, userHandle);
     }