Update microg icon

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

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

    android:width="@dimen/dashboard_tile_image_size"

    android:height="@dimen/dashboard_tile_image_size"

    android:width="24dp"

    android:height="24dp"

    android:viewportWidth="32"

    android:viewportHeight="32">

    <Preference

        android:key="microg_settings"

        android:title="@string/micro_g"

        android:icon="@drawable/ic_microg_settings"

        android:icon="@drawable/ic_homepage_microg"

        android:order="-252"

        android:fragment="com.android.settings.MicroGSettings">

        <intent android:action="android.intent.action.MAIN"