Clean up: remove preference_category_no_title.

<?xml version="1.0" encoding="utf-8"?>

<!-- Copyright (C) 2017 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.

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<!-- Based off frameworks/base/core/res/res/layout/preference_category_material.xml however

     set height to 0. This will be used in preference category without title in order to remove

     extra 32dp blank -->

<TextView xmlns:android="http://schemas.android.com/apk/res/android"

    android:id="@android:id/title"

    android:layout_width="match_parent"

    android:layout_height="0dp"

    android:textAppearance="@android:style/TextAppearance.Material.Body2"

    android:textColor="?android:attr/colorAccent"

    android:paddingStart="?android:attr/listPreferredItemPaddingStart"

    android:paddingEnd="?android:attr/listPreferredItemPaddingEnd" />

    <PreferenceCategory

        android:key="battery_tip"

        android:layout="@layout/preference_category_no_title" />

        android:layout="@layout/preference_category_no_label" />

    <Preference

        android:fragment="com.android.settings.fuelgauge.batterysaver.BatterySaverSettings"