Update Icon App Chip Menu to new specs.

Fix: 304228083
Test: TaplOverviewIconAppChipMenuTest
Flag: ACONFIG com.android.launcher3.enable_overview_icon_menu DEVELOPMENT

Change-Id: Ib018c7f59e1141b6f21618b28d411facc937ac7c
diff --git a/res/drawable/icon_menu_background.xml b/res/drawable/icon_menu_background.xml
index ec5f011..8a95c3e 100644
--- a/res/drawable/icon_menu_background.xml
+++ b/res/drawable/icon_menu_background.xml
@@ -17,6 +17,5 @@
 <shape xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:androidprv="http://schemas.android.com/apk/prv/res/android"
     android:shape="rectangle">
-    <solid android:color="?androidprv:attr/materialColorSurfaceContainer" />
-    <corners android:radius="@dimen/dialogCornerRadius" />
+    <solid android:color="?androidprv:attr/materialColorSurfaceBright" />
 </shape>
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