Camera2: Invoke saveVideo when mVideoFileDescriptor != null am: 4d60bff648

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Camera2/+/18547052

Change-Id: I893c083aedcead7237258a2c2aa566f5d1f012d5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>