Move SharedPreferences code to its own class.

Bug: 251502424
Test: Code compiled correctly.
Change-Id: Iea0d6ab2999504117546ee0f7adc0c7b8b45c065
diff --git a/src/com/android/launcher3/LauncherAppState.java b/src/com/android/launcher3/LauncherAppState.java
index ea3f723..4965936 100644
--- a/src/com/android/launcher3/LauncherAppState.java
+++ b/src/com/android/launcher3/LauncherAppState.java
@@ -18,7 +18,7 @@
 
 import static android.app.admin.DevicePolicyManager.ACTION_DEVICE_POLICY_RESOURCE_UPDATED;
 
-import static com.android.launcher3.Utilities.getDevicePrefs;
+import static com.android.launcher3.LauncherPrefs.getDevicePrefs;
 import static com.android.launcher3.util.Executors.MODEL_EXECUTOR;
 import static com.android.launcher3.util.SettingsCache.NOTIFICATION_BADGING_URI;
 
@@ -117,7 +117,7 @@
                 observer, MODEL_EXECUTOR.getHandler());
         mOnTerminateCallback.add(iconChangeTracker::close);
         MODEL_EXECUTOR.execute(observer::verifyIconChanged);
-        SharedPreferences prefs = Utilities.getPrefs(mContext);
+        SharedPreferences prefs = LauncherPrefs.getPrefs(mContext);
         prefs.registerOnSharedPreferenceChangeListener(observer);
         mOnTerminateCallback.add(
                 () -> prefs.unregisterOnSharedPreferenceChangeListener(observer));