SystemUI: Use accent color for WiFi progress bar

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

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

    <!-- I really don't want to define this, but the View that uses this asset uses both the

         light and dark accent colors. -->

    <item android:alpha="0.6" android:drawable="@*android:color/accent_device_default_light" />

</selector>

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

    <!-- I really don't want to define this, but the View that uses this asset uses both the

         light and dark accent colors. -->

    <item android:alpha="0.6" android:drawable="@*android:color/accent_device_default_dark" />

    <item android:alpha="0.6" android:color="?android:attr/colorAccent" />

</selector>