Remove popup indicator for dialog style preference items.

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

<!-- Copyright (C) 2006 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

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     distributed under the License is distributed on an "AS IS" BASIS,

     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

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<!-- Layout used by DialogPreference in a PreferenceActivity. -->

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

    android:layout_width="wrap_content"

    android:layout_height="wrap_content"

    android:layout_gravity="center"

    android:background="@drawable/btn_circle"

    android:src="@drawable/ic_btn_round_more" />

    <style name="Preference.DialogPreference">

        <item name="android:positiveButtonText">@android:string/ok</item>

        <item name="android:negativeButtonText">@android:string/cancel</item>

        <item name="android:widgetLayout">@android:layout/preference_dialog</item>

    </style>

    <style name="Preference.DialogPreference.YesNoPreference">

        <item name="android:ringtoneType">ringtone</item>

        <item name="android:showSilent">true</item>

        <item name="android:showDefault">true</item>

        <item name="android:widgetLayout">@android:layout/preference_dialog</item>

    </style>

    <!-- No margins or background by default. Could be different for x-large screens -->