[vdr] streamdev doesn't suspend live TV

Hi,

I think there is a bug in the way streamdev switches the channel before it starts streaming. I have only 1 tuner and suspend behaviour in streamdev-server is set to "always suspended". Unfortunately streaming doesn't stop live TV when the channel is on a different transponder. Streamdev switches the channel in cConnectionHTTP::ProcessRequest(), but before streaming is started the channel is switched back on a different thread in the main while loop in vdr.c (the statement with comment "Make sure we have a visible programme in case device usage has changed").

Michal