Don't archive smil on publication
Steps to reproduce
There are currently two smils being created, one on import and one during publication. The first is based on the composite video shown in the video editor, the other on the individual tracks. Currently the first smil is simply overwritten by the second on publication, which can create problems. For example, it is possible to select only the shorter track for publication, which leads to a cut segment appearing at the end of the video in the video editor afterwards.