Fix border color of security footer

Test: manual
Fixes: 186033456
Change-Id: Ibc09c4c3ac53f35c2759c01b396583131d536605

packages/SystemUI/res/color/qs_security_footer_background_stroke.xml

@@ -1,18 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!-- Copyright (C) 2014 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.
--->
-<selector xmlns:android="http://schemas.android.com/apk/res/android">
-    <item android:color="@android:color/system_neutral1_100" android:alpha="0.8" />
-</selector>

packages/SystemUI/res/drawable/qs_security_footer_background.xml

@@ -29,7 +29,7 @@
         <item>
             <shape android:shape="rectangle">
                 <stroke android:width="1dp"
-                        android:color="@color/qs_security_footer_background_stroke"/>
+                        android:color="?android:attr/colorBackground"/>
                 <corners android:radius="@dimen/qs_security_footer_corner_radius"/>
             </shape>
         </item>