[vdr] [Feature request] Always prefer DD-track

Hi.

I can't find feature that prefers always Dolby Digital/DTS track, even there it's not preferred language, and there is MPEG track in preferred language.

Some channels (like canal+) has 4 MPEG audio tracks (fin, swe, nor, dan) and one DD-track (which is eng or nor, depending on channel). I have 2 preferred languages; finnish as primary and english as secondary. VDR always chooses finnish MPEG-audio as default audio track.

I would like to _ALWAYS_ prefer dolby digital (if present) track as default, even if it's not on preferred languages.