Decoder: Fixed hang in the case of dangling field The u1_top_bottom_decoded flag in the decoder context has been fixed to be updated correctly in the case of dangling field Bug: 63315932 Test: ran POC after patching Change-Id: I8db4ebeb94fba735ba45f365c37e52a202ea84cd (cherry picked from commit 252628cffba8702e36b98c193bcd2fe67d8237ee)