audioadapter: perform setup again after a PortConfig

After the ports are reconfigured, we need to perform the setup again so
that buffers and processing can happen with the right settings.

This fixes an issue when autoswitching between A2DP and HFP with
bluetooth headsets when there is also a stereo capture device available.
The input stream of the browser is quickly reconfigured between stereo
and mono with only a Pause command in between, clearing the setup state
is enough to redo the setup when going back to Playing.

Fixes #2764

spa/plugins/audioconvert/audioconvert.c

@@ -979,6 +979,7 @@ static int reconfigure_mode(struct impl *this, enum spa_param_port_config_mode m
 	}
 
 	this->monitor = monitor;
+	this->setup = false;
 	dir->control = control;
 	dir->have_profile = true;
 	dir->mode = mode;