Change shortcut background to #FFFFFF, as per spec.

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

       android:shape="rectangle">

    <solid android:color="@color/quantum_panel_bg_color" />

    <solid android:color="#FFFFFF" />

    <corners android:radius="@dimen/bg_pill_radius" />

</shape>

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