Address visual inconsistency in smart replies

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

        android:color="@color/notification_ripple_untinted_color">

    <item>

        <inset

            android:insetLeft="0dp"

            android:insetTop="7dp"

            android:insetRight="0dp"

            android:insetBottom="5dp">

            <shape android:shape="rectangle">

            <!-- Use non-zero corner radius to work around b/73285195. The actual corner radius is

                 set dynamically at runtime in SmartReplyView. -->

            <corners android:radius="1dp"/>

                <corners android:radius="8dp" />

                <stroke android:width="1dp" android:color="@color/smart_reply_button_stroke" />

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

            </shape>

        </inset>

    </item>

</ripple>

<!-- android:paddingHorizontal is set dynamically in SmartReplyView. -->

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

        style="@android:style/Widget.Material.Button.Borderless.Small"

        style="@android:style/Widget.Material.Button"

        android:layout_width="wrap_content"

        android:layout_height="match_parent"

        android:minWidth="0dp"

        android:paddingVertical="@dimen/smart_reply_button_padding_vertical"

        android:background="@drawable/smart_reply_button_background"

        android:gravity="center"

        android:fontFamily="sans-serif"

        android:fontFamily="sans-serif-medium"

        android:textSize="@dimen/smart_reply_button_font_size"

        android:lineSpacingExtra="@dimen/smart_reply_button_line_spacing_extra"

        android:textColor="@color/smart_reply_button_text"

    android:id="@+id/smart_reply_view"

    android:layout_height="wrap_content"

    android:layout_width="wrap_content"

    android:layout_marginStart="12dp"

    systemui:spacing="@dimen/smart_reply_button_spacing"

    systemui:singleLineButtonPaddingHorizontal="@dimen/smart_reply_button_padding_horizontal_single_line"

    systemui:doubleLineButtonPaddingHorizontal="@dimen/smart_reply_button_padding_horizontal_double_line">

    <color name="zen_introduction">#ffffffff</color>

    <color name="smart_reply_button_text">#de000000</color> <!-- 87% black -->

    <color name="smart_reply_button_background">#fff2f2f2</color>

    <color name="smart_reply_button_text">#5F6368</color>

    <color name="smart_reply_button_background">#feffffff</color>

    <color name="smart_reply_button_stroke">#ffdadce0</color>

    <!-- Fingerprint dialog colors -->

    <color name="fingerprint_dialog_bg_color">#ffffffff</color> <!-- 100% white -->

    <!-- Smart reply button -->

    <dimen name="smart_reply_button_spacing">8dp</dimen>

    <dimen name="smart_reply_button_padding_vertical">10dp</dimen>

    <dimen name="smart_reply_button_padding_horizontal_single_line">12dp</dimen>

    <dimen name="smart_reply_button_padding_horizontal_single_line">16dp</dimen>

    <dimen name="smart_reply_button_padding_horizontal_double_line">16dp</dimen>

    <dimen name="smart_reply_button_min_height">40dp</dimen>

    <dimen name="smart_reply_button_min_height">32dp</dimen>

    <dimen name="smart_reply_button_font_size">14sp</dimen>

    <dimen name="smart_reply_button_line_spacing_extra">6sp</dimen> <!-- Total line height 20sp. -->