[mythtv] wrong size calculation in mytharchive

[Tino Keitel]

Hi folks,

my mytharchive is wrong when it comes to the size calculation before
the dvdauthor run:

Total size of video files, before multiplexing, is 3963 Mbytes, audio
is 275 MBytes, menus are 1 MBytes.

That makes 4239 MB (with 1 MB = 1048576 bytes). However, DVD+/-R have a
capacity of at least 4480 MB (4482 or 4482 IIRC).

As a result, tcrequant is used but it's not really necessary, as the
videos should fit on one DVD without tcrequant.

Regards,
Tino