Enable Retrys with Live=true LiveStreams

[Former user]

Reference: http://forum.serviio.org/viewtopic.php?f=22&t=13519&p=80329#p79695

I have determined that the ability of a renderer to retry playback after an ffmpeg error is dependent on the stream being declared live=false.

This ticket is to also enable retrys on live=true streams by generating an appropriate error back to the renderer..