Remove primaryUserOnly param from UsageStats

UsageStats App List will then has same behavior as other App Lists,
can show apps from work profile.

Bug: 284902200
Test: Manually on device with Headless System User Mode
Change-Id: Ibaf9a01b8d82c342a3aab73bafc9925c4b2ac146
diff --git a/src/com/android/settings/spa/development/UsageStats.kt b/src/com/android/settings/spa/development/UsageStats.kt
index b681d75..4d9c455 100644
--- a/src/com/android/settings/spa/development/UsageStats.kt
+++ b/src/com/android/settings/spa/development/UsageStats.kt
@@ -32,7 +32,6 @@
         AppListPage(
             title = stringResource(R.string.testing_usage_stats),
             listModel = rememberContext(::UsageStatsListModel),
-            primaryUserOnly = true,
         )
     }
 }