Use add icon for add custom input style menu

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

<!--

/*

**

** Copyright 2014, 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

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** 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.

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-->

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

    <item

        android:id="@+id/action_add_style"

        android:icon="@drawable/ic_add_circle_wht_24dp"

        android:title="@string/add_style"

        android:showAsAction="always" />

</menu>

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