Fix missing Material light more keys' background

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

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

    <item android:state_pressed="true"

          android:drawable="@drawable/btn_keyboard_key_popup_selected_lxx_light" />

    <item android:drawable="@android:color/transparent" />

</selector>

        parent="KeyboardView.LXX_Light"

    >

        <item name="android:background">@drawable/keyboard_popup_panel_background_lxx_light</item>

        <!-- Reuse KLP key background -->

        <item name="keyBackground">@drawable/btn_keyboard_key_popup_klp</item>

        <item name="keyBackground">@drawable/btn_keyboard_key_popup_lxx_light</item>

        <item name="keyTypeface">normal</item>

        <item name="verticalCorrection">@dimen/config_more_keys_keyboard_vertical_correction_holo</item>

    </style>