Add PowerUsageSummaryLegacy to Restricted list.

Then in guest/secondary user it is also possible to show
battery settings.

Bug: 70606597
Test: Manual
Change-Id: I7993abbf988926d0890229e9c14c779906be6e23

src/com/android/settings/core/gateway/SettingsGateway.java

@@ -271,6 +271,7 @@ public class SettingsGateway {
             Settings.SoundSettingsActivity.class.getName(),
             Settings.StorageDashboardActivity.class.getName(),
             Settings.PowerUsageSummaryActivity.class.getName(),
+            Settings.PowerUsageSummaryLegacyActivity.class.getName(),
             Settings.UserAndAccountDashboardActivity.class.getName(),
             Settings.SecuritySettingsActivity.class.getName(),
             Settings.AccessibilitySettingsActivity.class.getName(),