Update downloadable badge color and grid item radius

Screenshots:
  - Before (collection): screenshot/3sKAA4eRhYvbKt2.png
  - After (collection): screenshot/6n3PhDoU8VNb7DM.png
  - Before (thumbnail): screenshot/9PDNHySjwttbnLw.png
  - After (thumbnail): screenshot/AvPFrKUXkzXZLRc.png

Bug: 188734434
Test: Manual (visual comparison)
Change-Id: I6e4953fbff0b14a3540268344e8f23dc709bdd85
diff --git a/src/com/android/wallpaper/picker/CategorySelectorFragment.java b/src/com/android/wallpaper/picker/CategorySelectorFragment.java
index a506bca..a611d48 100644
--- a/src/com/android/wallpaper/picker/CategorySelectorFragment.java
+++ b/src/com/android/wallpaper/picker/CategorySelectorFragment.java
@@ -293,6 +293,7 @@
 
             CardView categoryView = itemView.findViewById(R.id.category);
             categoryView.getLayoutParams().height = mTileSizePx.y;
+            categoryView.setRadius(getResources().getDimension(R.dimen.grid_item_all_radius_small));
         }
 
         @Override
@@ -387,6 +388,7 @@
             CardView categoryView = itemView.findViewById(R.id.category);
             categoryView.getLayoutParams().height =
                     SizeCalculator.getFeaturedCategoryTileSize(getActivity()).y;
+            categoryView.setRadius(getResources().getDimension(R.dimen.grid_item_all_radius));
         }
     }