VolumeMonitor: Don't set stream on source output monitor
There's no way to set a monitor stream on a source output,
set_monitor_stream
only takes a sink_input_idx
.
There's also no point since by monitoring the device the app records, we know what the app will hear.
I looked at pavucontrol and that's what it's doing.
I can see me speaking under the "apps" tab now but only on the app that uses the right mic. (Please test this with multiple mics, I just tried with 1 app on headset + 1 app on monitor of output, not with 2 actual mics)
Should go into 5.24 imho.
Edited by Kai Uwe Broulik