Add a setting to control multi-user feature on/off.

Bug: 72319180
Test: n/a
Change-Id: I0fd00e9c278de8ece530cacd43aaeae854002f14
diff --git a/core/tests/coretests/src/android/provider/SettingsBackupTest.java b/core/tests/coretests/src/android/provider/SettingsBackupTest.java
index 156a2c0..d111160 100644
--- a/core/tests/coretests/src/android/provider/SettingsBackupTest.java
+++ b/core/tests/coretests/src/android/provider/SettingsBackupTest.java
@@ -442,6 +442,7 @@
                     Settings.Global.ENABLE_GNSS_RAW_MEAS_FULL_TRACKING,
                     Settings.Global.INSTALL_CARRIER_APP_NOTIFICATION_PERSISTENT,
                     Settings.Global.INSTALL_CARRIER_APP_NOTIFICATION_SLEEP_MILLIS,
+                    Settings.Global.USER_SWITCHER_ENABLED,
                     Settings.Global.NETWORK_ACCESS_TIMEOUT_MS,
                     Settings.Global.WARNING_TEMPERATURE,
                     Settings.Global.WEBVIEW_DATA_REDUCTION_PROXY_KEY,