Use new full screen user switching dialog on TV

Bug: 279819448
Test: Check UX on TV, atest CtsMultiUserHostTestCases
Change-Id: I2ff3f2c7f72408a2a7610102a3cf0edbf2cb5b96

core/res/res/layout-television/user_switching_dialog.xml

@@ -1,29 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!--
-     Copyright (C) 2015 The Android Open Source Project
-
-     Licensed under the Apache License, Version 2.0 (the "License");
-     you may not use this file except in compliance with the License.
-     You may obtain a copy of the License at
-
-          http://www.apache.org/licenses/LICENSE-2.0
-
-     Unless required by applicable law or agreed to in writing, software
-     distributed under the License is distributed on an "AS IS" BASIS,
-     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-     See the License for the specific language governing permissions and
-     limitations under the License.
--->
-
-<TextView xmlns:android="http://schemas.android.com/apk/res/android"
-        android:id="@+id/message"
-        style="?attr/textAppearanceListItem"
-        android:layout_width="match_parent"
-        android:background="@color/background_leanback_dark"
-        android:textColor="@color/primary_text_leanback_dark"
-        android:layout_height="match_parent"
-        android:gravity="center"
-        android:paddingStart="?attr/dialogPreferredPadding"
-        android:paddingEnd="?attr/dialogPreferredPadding"
-        android:paddingTop="24dp"
-        android:paddingBottom="24dp" />