systemui: Re-add recents clear-all icon

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

    android:width="24dp"

    android:height="24dp"

    android:viewportWidth="48.0"

    android:viewportHeight="48.0">

    <path

        android:fillColor="#ffffff"

        android:pathData="M8.0,19.994l32.0,0.0l0.0,8.0l-32.0,0.0z"/>

    <path

        android:fillColor="#ffffff"

        android:pathData="M0.0,32.0l32.0,0.0l0.0,7.979l-32.0,0.0z"/>

    <path

        android:fillColor="#ffffff"

        android:pathData="M16.0,8.0l32.0,0.0l0.0,8.0l-32.0,0.0z"/>

</vector>