Don't allow landscape mode for preview Activity am: a98c32e54b am: 4353a6cafe am: ce4557709a am: d70e8595bf

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/wallpapers/LivePicker/+/10433099

Change-Id: I4c4832cd4a7619b2124c897f892948ec0a4a8ae9