Remove "Wi-Fi only" option from Wi-Fi Calling settings

    <string-array name="wifi_calling_mode_choices">

        <item>Wi-Fi preferred</item>

        <item>Cellular preferred</item>

        <item>Wi-Fi only</item>

    </string-array>

    <string-array name="wifi_calling_mode_values">

        <item>"2"</item>

        <item>"1"</item>

        <item>"0"</item>

    </string-array>

    <!-- Wi-Fi Calling settings. Text displayed when Wi-Fi Calling is off -->

    <string name="wifi_calling_off_explanation">When Wi-Fi calling is on, your phone can route calls via Wi-Fi networks or your carrier\'s network, depending on your preference and which signal is stronger. Before turning on this feature, check with your carrier regarding fees and other details.</string>