ios: fix initialization warning in RN >= 0.47
ios: fix initialization warning in RN >= 0.47

zxcpoiu/react-native-webrtc,zxcpoiu/react-native-webrtc,zxcpoiu/react-native-webrtc,zxcpoiu/react-native-webrtc,zxcpoiu/react-native-webrtc,zxcpoiu/react-native-webrtc