overlay: Enable rounded corners for dialogues and buttons

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

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<resources>

    <dimen name="config_dialogCornerRadius">8.0dip</dimen>

    <dimen name="config_buttonCornerRadius">4.0dip</dimen>

    <dimen name="config_progressBarCornerRadius">1000.0dip</dimen>

</resources>