ActiveAE: Only transcode to ac3 when input has more than two channels

ANALOG is a bit of a problem.

If you have set HDMI and your normal output device, you still want mp3 and other stuff played as PCM and not as AC3, therefore also check to have more than 2 channels before choosing AC3 as default output.

@FernetMenta: The fix from yesterday is still valid I think, as i see no need in converting e.g. 2 channel {DTS, DTS-HD, TrueHD, etc.} to AC3. as it can played as 2.0 pcm easily.