fix: Improve speaker switching logic for iOS.

[cloudwebrtc]

Refer to swift sdk for improvement. By default, setSpeakerphoneOn(true |false); will switch between Receiver or Speaker. It will still give priority to wired wired/bluetooth headphones if connected.

But you can ignore all wired/bluetooth headphones and force them to output from the speaker through forceSpeakerOutput: true.

[petodavid]

As I see room.setSpeakerOn is ignored and it does not use the speaker, but by setting the default room options its working, can you confirm this behavior?

    roomOptions: RoomOptions(
      enableVisualizer: true,
      defaultAudioOutputOptions: AudioOutputOptions(speakerOn: true),
    ),

[cloudwebrtc]

@petodavid , fixed in this PR.