Set fit insets type for decor insets test am: 614ed9e0 am: 85339755

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23468179



Change-Id: I10ff164d048b688181a9d65c42f626f53e649b2d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>