Update fingerprint/face enrollment to lock icon

Bug: 187460696
Test: manual
Change-Id: I490ad4246e54ed4ae2e8539e8e9eabba1ccecff6
diff --git a/res/values/styles.xml b/res/values/styles.xml
index 5fa2f56..6021a7c 100644
--- a/res/values/styles.xml
+++ b/res/values/styles.xml
@@ -369,11 +369,11 @@
     </style>
 
     <style name="FingerprintLayoutTheme">
-        <item name="android:icon">@drawable/ic_fingerprint_header</item>
+        <item name="android:icon">@drawable/ic_lock</item>
     </style>
 
     <style name="FaceLayoutTheme">
-        <item name="android:icon">@drawable/ic_face_header</item>
+        <item name="android:icon">@drawable/ic_lock</item>
     </style>
 
     <style name="PreviewPagerPageIndicator">