Added horizontal seperator in Face Settings

Test: Manual.
Bug: 140965037
Change-Id: I05bfa9b1826c5d4dfcbba6cbe2d2e320014950e3
Merged-In: I05bfa9b1826c5d4dfcbba6cbe2d2e320014950e3
diff --git a/res/xml/security_settings_face.xml b/res/xml/security_settings_face.xml
index 7d59f30..e613470 100644
--- a/res/xml/security_settings_face.xml
+++ b/res/xml/security_settings_face.xml
@@ -64,7 +64,11 @@
             android:summary="@string/security_settings_face_settings_require_confirmation_details"
             app:keywords="@string/keywords_face_unlock"
             app:controller="com.android.settings.biometrics.face.FaceSettingsConfirmPreferenceController"/>
+    </PreferenceCategory>
 
+    <PreferenceCategory
+        android:key="security_settings_face_button_category"
+        android:title="@string/security_settings_face_preference_title">
         <com.android.settingslib.widget.LayoutPreference
             android:key="security_settings_face_delete_faces_container"
             android:selectable="false"
@@ -73,7 +77,7 @@
         <com.android.settingslib.widget.LayoutPreference
             android:key="security_settings_face_enroll_faces_container"
             android:selectable="false"
-            android:layout="@layout/face_enroll_button " />
+            android:layout="@layout/face_enroll_button" />
     </PreferenceCategory>
 
     <PreferenceCategory