move the tpc transform logs to debug

jitsi-meet has been changed to have tpc.js on info by default, so these
logs still won't show by default.

modules/RTC/TraceablePeerConnection.js

 
     // override as desired
     this.trace = (what, info) => {
-        /* logger.warn('WTRACE', what, info);
+        logger.debug(what, info);
+
+        /*
         if (info && RTCBrowserType.isIExplorer()) {
             if (info.length > 1024) {
                 logger.warn('WTRACE', what, info.substr(1024));