Removing file IO used for checking configuration change

> This check was used for flushing the cache, but since the cache
is backed by a DB, this has no effect as same icons are loaded again

Change-Id: Ib7d8a8598c5d225d922e095c899dc11ad06f2b7a
diff --git a/src/com/android/launcher3/LauncherFiles.java b/src/com/android/launcher3/LauncherFiles.java
index 03ec4bf..c08cd0b 100644
--- a/src/com/android/launcher3/LauncherFiles.java
+++ b/src/com/android/launcher3/LauncherFiles.java
@@ -17,7 +17,6 @@
     public static final String DEFAULT_WALLPAPER_THUMBNAIL = "default_thumb2.jpg";
     public static final String DEFAULT_WALLPAPER_THUMBNAIL_OLD = "default_thumb.jpg";
     public static final String LAUNCHER_DB = "launcher.db";
-    public static final String LAUNCHER_PREFERENCES = "launcher.preferences";
     public static final String SHARED_PREFERENCES_KEY = "com.android.launcher3.prefs";
     public static final String WALLPAPER_CROP_PREFERENCES_KEY =
             "com.android.launcher3.WallpaperCropActivity";
@@ -31,7 +30,6 @@
             DEFAULT_WALLPAPER_THUMBNAIL,
             DEFAULT_WALLPAPER_THUMBNAIL_OLD,
             LAUNCHER_DB,
-            LAUNCHER_PREFERENCES,
             SHARED_PREFERENCES_KEY + XML,
             WALLPAPER_CROP_PREFERENCES_KEY + XML,
             WALLPAPER_IMAGES_DB,
@@ -43,5 +41,6 @@
     public static final List<String> OBSOLETE_FILES = Collections.unmodifiableList(Arrays.asList(
             "launches.log",
             "stats.log",
+            "launcher.preferences",
             "com.android.launcher3.compat.PackageInstallerCompatV16.queue"));
 }