Ensure WFD switch is removed along with settings fragment.

Bug: 8340072
Change-Id: I8d203725ef1bfa5b1b5e5c224fa57d5feaa9db5a
diff --git a/src/com/android/settings/wfd/WifiDisplaySettings.java b/src/com/android/settings/wfd/WifiDisplaySettings.java
index 60dd119..5b732d6 100755
--- a/src/com/android/settings/wfd/WifiDisplaySettings.java
+++ b/src/com/android/settings/wfd/WifiDisplaySettings.java
@@ -117,6 +117,12 @@
     }
 
     @Override
+    public void onDestroyView() {
+        getActivity().getActionBar().setCustomView(null);
+        super.onDestroyView();
+    }
+
+    @Override
     public void onResume() {
         super.onResume();