Disable audio processing which deadlocks on UWP

Set audio buffer events to false, which disable audio processing
registration. The audio processing callbacks in UWP use
WebrtcObserver::Process() which defers the work to another thread and
blocks, while holding the audio capture or render lock. If that other
thread (e.g. UI thread) is blocking on the signaling thread to do some
audio property change, which in turn often need the audio capture or
render lock to actually apply those changes, the whole system deadlocks.
As there is currently no use for audio processing (not exposed), disable
it altogether.

Author: jehumb-havok

libs/Microsoft.MixedReality.WebRTC.Native/src/api.cpp

@@ -191,7 +191,7 @@ class GlobalFactory {
       factoryConfig->thisWeak_ = factoryConfig;  // mimic wrapper_create()
       factoryConfig->audioCapturingEnabled = true;
       factoryConfig->audioRenderingEnabled = true;
-      factoryConfig->enableAudioBufferEvents = true;
+      factoryConfig->enableAudioBufferEvents = false;
       impl_ = std::make_shared<wrapper::impl::org::webRtc::WebRtcFactory>();
       impl_->thisWeak_ = impl_;  // mimic wrapper_create()
       impl_->wrapper_init_org_webRtc_WebRtcFactory(factoryConfig);