Volume up/down keys did not control video volume on Samsung smart TV

The bug occurred because volume controls are implemented via <object>
tags and the CSS had a "body > object { display: none; }" rule.

The <object> do take space though. Moving them to the end of the
body places them out of view.

Related bug in Pivotal:
https://www.pivotaltracker.com/story/show/55292032