Remove the border around the icon when in dark mode

Use same color with background to draw the border color
when in dark mode.

Bug: 159757430
Test: manually test
Change-Id: Ice5bb3f06a4d90ef738fe51da2d7d55e8d2f530a

packages/SettingsLib/AdaptiveIcon/res/values-night/colors.xml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2020 The Android Open Source Project
+
+     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,
+     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.
+-->
+
+<resources>
+    <color name="advanced_outline_color">#FFFFFFFF</color> <!-- icon outline color -->
+</resources>