Add new fade color for expiration sheet.

app/src/main/res/drawable/expired_badge_fade.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <shape xmlns:android="http://schemas.android.com/apk/res/android">
     <gradient
-        android:endColor="@color/signal_background_dialog"
+        android:endColor="@color/signal_colorSurface1"
         android:startColor="@color/transparent"
         android:type="linear" />
 </shape>