Click "Users & Profile" in Settings Search displays a blueline

- It is a preference category, remove it from search result.

Fixes: 118654997
Test: Clear Settings Sugggestion data and search again.
Change-Id: I5a41e03c3fa703913233353a90b65ae18a7ab06b

res/xml/user_settings.xml

@@ -23,7 +23,8 @@
     <PreferenceCategory
         android:key="user_list"
         android:title="@string/user_list_title"
-        android:order="10">
+        android:order="10"
+        settings:searchable="false">
     </PreferenceCategory>
 
     <com.android.settingslib.RestrictedPreference