Control user switching UI visibility according to config

Bug: 375394047
Test: atest UserDetailsSettingsTest UserSettingsTest
Test: build platform with config overrides, check the result
Flag: EXEMPT Desktop-only change
Change-Id: Iaf1ac6c98a648066bf77b069039dcd59e243835f

src/com/android/settings/users/UserDetailsSettings.java

@@ -354,6 +354,8 @@ public class UserDetailsSettings extends SettingsPreferenceFragment
 
         mGrantAdminPref.setChecked(mUserInfo.isAdmin());
 
+        mSwitchUserPref.setVisible(mUserCaps.mUserSwitchingUiEnabled);
+
         mSwitchUserPref.setTitle(
                 context.getString(com.android.settingslib.R.string.user_switch_to_user,
                         mUserInfo.name));