Changed the color of low-priority notifications

    <color name="notification_material_background_dimmed_color">#d4ffffff</color>

    <!-- The color of the material notification background when low priority -->

    <color name="notification_material_background_low_priority_color">#ffdcdcdc</color>

    <color name="notification_material_background_low_priority_color">#ffe0e0e0</color>

    <!-- The color of the ripples on the untinted notifications -->

    <color name="notification_ripple_untinted_color">#20000000</color>