Update backgroundcolor of advanced bt header image

BUG: 362547405
Test: local tested
Flag: EXEMPT minor UI fix
Change-Id: I3aa400a64b95f067b380ed94564ee180341e8b70

res/drawable/bt_header_circle_outline.xml

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  Copyright (C) 2024 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.
+  -->
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+       android:shape="oval">
+    <solid android:color="@color/settingslib_materialColorSurfaceBright"/>
+    <stroke
+        android:width="1dp"
+        android:color="@color/settingslib_materialColorOutlineVariant"/>
+</shape>

res/layout/advanced_bt_entity_sub.xml

@@ -34,7 +34,7 @@
             android:layout_height="72dp"
             android:layout_gravity="center"
             android:antialias="true"
-            android:background="@drawable/circle_outline"
+            android:background="@drawable/bt_header_circle_outline"
             android:padding="8dp"
             android:scaleType="fitCenter" />