String "linphonerc222" should be "linphonerc"

https://github.com/cwliu/linphone-swift-demo/blob/de116e29ce25938168980abf5a3e9df4a237b4f6/linphone-trial/LinphoneManager.swift#L73

I guess the typing `linphonerc222` should be `linphonerc` to match the file 
[linphonerc](https://github.com/cwliu/linphone-swift-demo/blob/master/linphonerc)