Change the target activity of CategoryPickerActivity alias am: b913bd7f10 am: 027e473842 am: 022af88a32

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/WallpaperPicker2/+/15135442

Change-Id: I35218b74a7a96fd784949b8f152605860062341a