fix grey panel on top of settings

Bug introduced because changed layout of headers fragment.

b/17436246

Change-Id: Ie46673099894ceb3b64513b2d0ba315fdccbb2a4
diff --git a/v17/leanback/src/android/support/v17/leanback/app/HeadersFragment.java b/v17/leanback/src/android/support/v17/leanback/app/HeadersFragment.java
index 288640c..6225a59 100644
--- a/v17/leanback/src/android/support/v17/leanback/app/HeadersFragment.java
+++ b/v17/leanback/src/android/support/v17/leanback/app/HeadersFragment.java
@@ -139,7 +139,7 @@
     private void updateListViewVisibility() {
         final VerticalGridView listView = getVerticalGridView();
         if (listView != null) {
-            listView.setVisibility(mHeadersGone ? View.GONE : View.VISIBLE);
+            getView().setVisibility(mHeadersGone ? View.GONE : View.VISIBLE);
             if (!mHeadersGone) {
                 if (mHeadersEnabled) {
                     listView.setChildrenVisibility(View.VISIBLE);