broadcast & broadcast/youtube.go: on broadcast retry rtmp variable being set too many times

[Saxon Milton]

When there is a retry to promote a broadcast to live, there appears to be multiple times the RTMP variable it set, e.g.

Need to figure out why this is and fix.

[Saxon Milton]

broadcast.go: fixing multiple RTMP var assignments for broadcast retry. Resolves issue #194

→ <<cset bdd8bbffe637>>