Merge pull request #717 from tsareg/error_types

Expose JitsiTrackError through JitsiMeetJS.errorTypes.JitsiTrackError

modules/UI/UI.js

 UI.showDeviceErrorDialog = function (micError, cameraError) {
     let localStoragePropName = "doNotShowErrorAgain";
     let isMicJitsiTrackErrorAndHasName = micError && micError.name &&
-        micError instanceof JitsiMeetJS.JitsiTrackError;
+        micError instanceof JitsiMeetJS.errorTypes.JitsiTrackError;
     let isCameraJitsiTrackErrorAndHasName = cameraError && cameraError.name &&
-        cameraError instanceof JitsiMeetJS.JitsiTrackError;
+        cameraError instanceof JitsiMeetJS.errorTypes.JitsiTrackError;
     let showDoNotShowWarning = false;
 
     if (micError && cameraError && isMicJitsiTrackErrorAndHasName &&