Update media.html following audio and video html transformation fixes
Update media.html following audio and video html transformation fixes

- Remove "src" from audio and video tags as <source> is already used
- If autoplay is true, set autoplay="autoplay" in audio and video tags,
  if autoplay is false, remove the attribute

Connexions/rhaptos.cnxmlutils,Connexions/rhaptos.cnxmlutils,Connexions/rhaptos.cnxmlutils,Connexions/rhaptos.cnxmlutils,Connexions/rhaptos.cnxmlutils