Fix ANR on ShorcutManager#getPinnedShortcuts

By design, ShorcutManager#getPinnedShortcuts is meant to called on
a work thread.

Fix: 183785618
Test: Switch the user profile, and function works properly.
Change-Id: I87b8d3f57123ff12f83f95fc7f053b8840028ebe
diff --git a/src/com/android/settings/SettingsInitialize.java b/src/com/android/settings/SettingsInitialize.java
index 5157033..cd949de 100644
--- a/src/com/android/settings/SettingsInitialize.java
+++ b/src/com/android/settings/SettingsInitialize.java
@@ -39,6 +39,7 @@
 import androidx.annotation.VisibleForTesting;
 
 import com.android.settings.Settings.CreateShortcutActivity;
+import com.android.settingslib.utils.ThreadUtils;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -62,7 +63,7 @@
         final PackageManager pm = context.getPackageManager();
         managedProfileSetup(context, pm, broadcast, userInfo);
         webviewSettingSetup(context, pm, userInfo);
-        refreshExistingShortcuts(context);
+        ThreadUtils.postOnBackgroundThread(() -> refreshExistingShortcuts(context));
     }
 
     private void managedProfileSetup(Context context, final PackageManager pm, Intent broadcast,
@@ -142,5 +143,4 @@
         }
         shortcutManager.updateShortcuts(updates);
     }
-
 }