Remove spammy RTCSession log line

[dbkr]

This can get quite spammy in rooms with legacy calls and isn't really neccesary: remove it to cut down on the log spam.

Checklist

• [ ] Tests written for new code (and old code if feasible).
• [ ] New or updated public/exported symbols have accurate TSDoc documentation.
• [ ] Linter and other CI checks pass.
• [ ] Sign-off given on the changes (see CONTRIBUTING.md).