fix(RTC): Use import instead of require for JitsiTrackError

modules/RTC/RTC.js

@@ -6,8 +6,8 @@ var RTCEvents = require("../../service/RTC/RTCEvents.js");
 var RTCUtils = require("./RTCUtils.js");
 var JitsiTrack = require("./JitsiTrack");
 var JitsiLocalTrack = require("./JitsiLocalTrack.js");
-var JitsiTrackErrors = require("../../JitsiTrackErrors");
-var JitsiTrackError = require("../../JitsiTrackError");
+import JitsiTrackError from "../../JitsiTrackError";
+import * as JitsiTrackErrors from "../../JitsiTrackErrors";
 var DataChannels = require("./DataChannels");
 var JitsiRemoteTrack = require("./JitsiRemoteTrack.js");
 var MediaType = require("../../service/RTC/MediaType");