Don't give audio tags a height style

Without refactoring how the TimedMediaTransformOutput and
TimedMediaHandler classes handle outputting audio files, this is the
simplest change to stop audio tags being styled with a height.

Bug: 71365
Change-Id: I20bc3f6edc5669bcf91d5cf5feff1c4cee05fbf4
Merge "Don't give audio tags a height style"