Connect application/device audio directly to gsr recording node.
This fixes an issue for some users where gsr-app-sink got selected by
default as an output device.
Dont wait until audio node first receives audio before recording audio
from the device. This might fix audio/video desync issue when recording
from microphone for example.
Use -a "app:brave" instead of -aa "brave".
Use -a "app-inverse:brave" instead of -aai "brave".
This now allows merging audio devices and app audio into the same audio
track.
