Fix unavailable wifi icon in wifi priorities

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

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

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

    <item settings:state_encrypted="true" android:drawable="@drawable/ic_wifi_lock_signal_1_dark" />

    <item settings:state_encrypted="false" android:drawable="@drawable/ic_wifi_signal_1_dark" />

    <item settings:state_encrypted="true">

        <layer-list>

            <item android:drawable="@drawable/ic_wifi_signal_0" />

            <item android:drawable="@drawable/ic_wifi_signal_lock" />

        </layer-list>

    </item>

    <item settings:state_encrypted="false" android:drawable="@drawable/ic_wifi_signal_0" />

</selector>