[Darwin] Fix incorrect syntax in private api in `RTCConfiguration` #565 (#566)
[Darwin] Fix incorrect syntax in private api in `RTCConfiguration` #565 (#566)

Co-authored-by: Ayman-Barghout <f35b8667be537e5c00448b0c467a982f7e1330be@gmail.com>
flutter-webrtc/flutter-webrtc,flutter-webrtc/flutter-webrtc,flutter-webrtc/flutter-webrtc,flutter-webrtc/flutter-webrtc,flutter-webrtc/flutter-webrtc,flutter-webrtc/flutter-webrtc,flutter-webrtc/flutter-webrtc,flutter-webrtc/flutter-webrtc