Make WIFI_IDLE_MS default into an overlay

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

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<resources>

    <!-- Default for Settings.Global.WIFI_IDLE_MS (15 minutes) -->

    <integer name="def_wifi_idle_ms">900000</integer>

</resources>

    <java-symbol type="string" name="tethered_notification_no_device_message" />

    <java-symbol type="string" name="tethered_notification_no_device_message" />

    <java-symbol type="string" name="tethered_notification_one_device_message" />

    <java-symbol type="string" name="tethered_notification_one_device_message" />

    <java-symbol type="string" name="tethered_notification_multi_device_message" />

    <java-symbol type="string" name="tethered_notification_multi_device_message" />

    <!-- Wifi idle time default -->

    <java-symbol type="integer" name="def_wifi_idle_ms" />

</resources>

</resources>