RTCDTMFSenderBackend::onTonePlayed callback does not need any parameter
<rdar://problem/98774949>
Pull request: https://github.com/WebKit/WebKit/pull/3401
Committed 253550@main (42a10b5f848f): <https://commits.webkit.org/253550@main> Reviewed commits have been landed. Closing PR #3401 and removing active labels.