Fix lock screen layouts with emergency call buttons.

<?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_default_pressed" />

    <item android:state_focused="true" android:state_enabled="true"

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

    <item android:state_enabled="true"

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

</selector>