MediaTemplate ignores CompressionLevel attribute

[wixbot]

Creating package with WiX 3.7 or 3.8.408 using MediaTemplate (instead of direct declaring Media) - everything goes fine, except that compression level always looks as default. I.e. cabinet file always becomes compressed even when compression level is none, or looks as it compressed with default level, even if i'm specify high level. For Media element - compression level attribute goes fine.

Originally opened by fddima from http://sourceforge.net/p/wix/bugs/3262/