Allow the default mode for video peek to be undefined am: e6f46638

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/av/+/18579466



Change-Id: I930c029362104e06d84003d78004244aa4ead4f9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>