[confluence] add 'Bluray Disc' flag to be displayed

Currently we display nothing when it comes to bluray ISO files.
Since we don't pull the "actual" streamdetails from a bluray disc but just put it as "BDMV" we at least could show it as "Bluray disc". So instead of putting a H264 or AVC flag better use a common one.


Mediainfo of bluray disc:
http://paste.ubuntu.com/1488452/

XBMC puts this as BDMV codec instead of the actual used codec.

Also see logs added to the ticket. 
http://trac.xbmc.org/ticket/11718