Remove empty Security status header

Change-Id: Ia09dfd67bcfb8334439bfb9dab419235b182e297

res/xml/security_dashboard_settings.xml

@@ -21,12 +21,6 @@
     android:key="security_dashboard_page"
     android:title="@string/security_settings_title">
 
-    <!-- security_settings_status.xml -->
-    <PreferenceCategory
-        android:order="-10"
-        android:key="security_status"
-        android:title="@string/security_status_title" />
-
     <PreferenceCategory
         android:order="1"
         android:key="dashboard_tile_placeholder" />