Migrate Spinner on Battery Usage to settingsLib Spinner widget.

Bug: 359429437
Test: visual
Test: atest BatteryUsageBreakdownControllerTest
Flag: EXEMPT bug fix
Change-Id: I71bd1f31db302d407603c71d1a1163ed22fafed8

res/layout/preference_spinner.xml

@@ -1,24 +0,0 @@
-<!--
-  ~ Copyright (C) 2023 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.
-  -->
-
-<Spinner
-    xmlns:android="http://schemas.android.com/apk/res/android"
-    android:id="@+id/spinner"
-    android:layout_width="wrap_content"
-    android:layout_height="wrap_content"
-    android:layout_marginStart="24dp"
-    android:layout_marginTop="8dp"
-    android:theme="@style/Widget.PopupWindow.Settings" />