fix(RTC): Fix log formatting

modules/RTC/RTC.js

      * @private
      */
     _senderVideoConstraintsChanged(senderVideoConstraints) {
-        logger.info(`Received remote max frame height of ${senderVideoConstraints} on the bridge channel`);
+        logger.info('Remote max frame height received on bridge channel: ', JSON.stringify(senderVideoConstraints));
         this._senderVideoConstraints = senderVideoConstraints;
         this.eventEmitter.emit(RTCEvents.SENDER_VIDEO_CONSTRAINTS_CHANGED);
     }

modules/RTC/RTCUtils.js

  */
 function onMediaDevicesListChanged(devicesReceived) {
     availableDevices = devicesReceived.slice(0);
-    logger.info(
-        'list of media devices has changed:',
-        availableDevices);
+    logger.info('list of media devices has changed:', availableDevices);
 
     sendDeviceListToAnalytics(availableDevices);
 
     getUserMediaWithConstraints(um, options = {}) {
         const constraints = getConstraints(um, options);
 
-        logger.info('Get media constraints', constraints);
+        logger.info('Get media constraints', JSON.stringify(constraints));
 
         return new Promise((resolve, reject) => {
             navigator.mediaDevices.getUserMedia(constraints)
                 resolve(stream);
             })
             .catch(error => {
-                logger.warn('Failed to get access to local media. '
-                    + ` ${error} ${constraints} `);
+                logger.warn(`Failed to get access to local media. ${error} ${JSON.stringify(constraints)}`);
                 updateGrantedPermissions(um, undefined);
                 reject(new JitsiTrackError(error, constraints, um));
             });
                     resolve(stream);
                 })
                 .catch(error => {
-                    logger.warn('Failed to get access to local media. '
-                        + ` ${error} ${constraints} `);
+                    logger.warn(`Failed to get access to local media. ${error} ${JSON.stringify(constraints)}`);
                     updateGrantedPermissions(umDevices, undefined);
                     reject(new JitsiTrackError(error, constraints, umDevices));
                 });
             const constraints = newGetConstraints(
                 requestedCaptureDevices, options);
 
-            logger.info('Got media constraints: ', constraints);
+            logger.info('Got media constraints: ', JSON.stringify(constraints));
 
             return this._newGetUserMediaWithConstraints(
                 requestedCaptureDevices, constraints);