codec2 vts: Fix handling of codec config flag in decoders am: 3b693092 am: 962718b7

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/av/+/24680952



Change-Id: Id9a8664f56ddfaa2df7e2acb01630cf8f0097724
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>