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: I8c6f9df66bbf860352c67732965bf3d86abb0208
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>