fix(pwa) fix auto-generated TWA icons

twa/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml

@@ -1,33 +1,5 @@
-<!--
+<?xml version="1.0" encoding="utf-8"?>
-    Copyright 2019 Google Inc. All Rights Reserved.
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
-
+    <background android:drawable="@color/ic_launcher_background"/>
-     Licensed under the Apache License, Version 2.0 (the "License");
+    <foreground android:drawable="@mipmap/ic_launcher_foreground"/>
-     you may not use this file except in compliance with the License.
+</adaptive-icon>
-     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,
-     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-     See the License for the specific language governing permissions and
-     limitations under the License.
--->
-<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:aapt="http://schemas.android.com/aapt">
-    <background>
-        <layer-list>
-            <item android:drawable="@android:color/white" />
-            <!-- 
-                The paddings below give the icons a similar proportion as the
-                icon generated by WebAPKs.
-            -->
-            <item android:drawable="@mipmap/ic_maskable"
-                android:top="8.5dp"
-                android:right="8.5dp"
-                android:left="8.5dp"
-                android:bottom="8.5dp" />
-        </layer-list>
-    </background>
-    <foreground android:drawable="@android:color/transparent" />
-</adaptive-icon>

twa/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@color/ic_launcher_background"/>
+    <foreground android:drawable="@mipmap/ic_launcher_foreground"/>
+</adaptive-icon>

twa/app/src/main/res/values/ic_launcher_background.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="ic_launcher_background">#66A8DD</color>
+</resources>