Ensure WFD switch is removed along with settings fragment.

Bug: 8340072
Change-Id: I8d203725ef1bfa5b1b5e5c224fa57d5feaa9db5a

src/com/android/settings/wfd/WifiDisplaySettings.java

@@ -116,6 +116,12 @@ public final class WifiDisplaySettings extends SettingsPreferenceFragment {
         }
     }
 
+    @Override
+    public void onDestroyView() {
+        getActivity().getActionBar().setCustomView(null);
+        super.onDestroyView();
+    }
+
     @Override
     public void onResume() {
         super.onResume();