AOSP/WallpaperPicker - update the WallpaperPicker test package version to target P (28) or higher. am: f147ac2fdb am: b50b0d2d71 am: 7e4e26fee6 am: 4fd92c6175 am: 26df17875a

Change-Id: I3127d498755be913b58432e9ef628a7ffc07e04e