fix: Removed outdated code to avoid UI not being displayed in Windows release mode (flutter-webrtc#1890)

Author: cloudwebrtc

example/lib/main.dart

@@ -1,7 +1,5 @@
 import 'dart:core';
 
-import 'package:flutter/foundation.dart'
-    show debugDefaultTargetPlatformOverride;
 import 'package:flutter/material.dart';
 import 'package:flutter_background/flutter_background.dart';
 import 'package:flutter_webrtc/flutter_webrtc.dart';
@@ -17,11 +15,6 @@ import 'src/route_item.dart';
 
 void main() {
   WidgetsFlutterBinding.ensureInitialized();
-  if (WebRTC.platformIsDesktop) {
-    debugDefaultTargetPlatformOverride = TargetPlatform.fuchsia;
-  } else if (WebRTC.platformIsAndroid) {
-    //startForegroundService();
-  }
   runApp(MyApp());
 }