Minor fixes to new gallery parsing

Remove sSystemStaticCategories from DefaultCategoryProvider since it's
not being used in this class.

Bug: 152634213
Change-Id: I3ef906e3c42688ba959db392dea0875109be33d4
diff --git a/src/com/android/wallpaper/module/DefaultCategoryProvider.java b/src/com/android/wallpaper/module/DefaultCategoryProvider.java
index 2aaf38d..43341d5 100755
--- a/src/com/android/wallpaper/module/DefaultCategoryProvider.java
+++ b/src/com/android/wallpaper/module/DefaultCategoryProvider.java
@@ -70,7 +70,6 @@
     private static final int PRIORITY_ON_DEVICE = 200;
     private static final int PRIORITY_LIVE = 300;
     private static final int PRIORITY_THIRD_PARTY = 400;
-    protected static List<Category> sSystemStaticCategories;
     protected static List<Category> sSystemCategories;
 
     protected final Context mAppContext;