core: legacy toasts deserve rounded corners too

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

<!--

/* Copyright 2017, The Android Open Source Project

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** Licensed under the Apache License, Version 2.0 (the "License");

** you may not use this file except in compliance with the License.

** You may obtain a copy of the License at

**

**     http://www.apache.org/licenses/LICENSE-2.0

**

** Unless required by applicable law or agreed to in writing, software

** distributed under the License is distributed on an "AS IS" BASIS,

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** See the License for the specific language governing permissions and

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-->

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

       android:shape="rectangle">

    <solid android:color="?android:attr/colorBackground" />

    <corners android:radius="28dp" />

</shape>

    android:orientation="horizontal"

    android:gravity="center_vertical"

    android:maxWidth="@dimen/toast_width"

    android:background="?android:attr/colorBackground"

    android:background="@drawable/toast_frame_legacy"

    android:elevation="@dimen/toast_elevation"

    android:layout_marginEnd="16dp"

    android:layout_marginStart="16dp"

    android:orientation="horizontal"

    android:gravity="center_vertical"

    android:maxWidth="@dimen/toast_width"

    android:background="?android:attr/colorBackground"

    android:background="@drawable/toast_frame_legacy"

    android:elevation="@dimen/toast_elevation"

    android:layout_marginEnd="16dp"

    android:layout_marginStart="16dp"