Use check mark to indicate the applied wallpaper

Spec:
  https://screenshot.googleplex.com/8fCqWYnxXNgwbAR.png
  https://www.figma.com/file/OG3c0WuO6IWtKn7yZ5IQCw/BC-x-Next-Wallpaper-%26-style?node-id=6949%3A39971

Result:
  2 columns: https://screenshot.googleplex.com/BAkYSbNU3dVhjBr.png
  3 columns: https://screenshot.googleplex.com/4LR6VBuMA3qhJfS.png

Bug: 192415835
Test: manual
Change-Id: Ic051b54b8cbf84def8250c357dc7f92d3942221f
diff --git a/res/layout/grid_item_my_photos.xml b/res/layout/grid_item_my_photos.xml
index eab77dc..e88b21e 100755
--- a/res/layout/grid_item_my_photos.xml
+++ b/res/layout/grid_item_my_photos.xml
@@ -27,7 +27,7 @@
         android:focusable="true"
         android:foreground="?attr/selectableItemBackground">
 
-        <com.android.wallpaper.picker.individual.CustomShapeImageView
+        <ImageView
             android:id="@+id/thumbnail"
             android:layout_width="match_parent"
             android:layout_height="match_parent"