Set fit insets type for decor insets test am: 614ed9e0 am: 85339755 am: 47d958b4

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



Change-Id: I98fbd839bff8dd68b66822ee08ec6ee166c0bb83
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>