修改测试版app标题卡名称

lib/main.dart

@@ -1,4 +1,5 @@
 import 'dart:async';
+import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_localizations/flutter_localizations.dart';
@@ -56,7 +57,7 @@ class MyApp extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return MaterialApp(
-      title: '粮食质量管理',
+      title: '粮食质量管理${kReleaseMode ? '' : '-测试'}',
       theme: ThemeData(
         colorScheme: ColorScheme.fromSeed(
           seedColor: Colors.blue,