Video content object leaves unused video files on the server

Steps to Reproduce

1. In your multimedia folder, create a new video content object
2. Browse a new video file from the content object
3. Confirm a new file will exist in the server

   ls ezpublish_legacy/var/ezdemo_site/storage/original/video
   

4. Store draft and exit
5. Confirm a new file will exist in the server

   ls ezpublish_legacy/var/ezdemo_site/storage/original/video
   

6. Publish the object
7. Confirm that, at least one unused video file will be left on the server