修复移除监听的写法

bytedesk_kefu/lib/ui/chat/page/chat_kf_page.dart

@@ -127,24 +127,18 @@ class _ChatKFPageState extends State<ChatKFPage>
     print('发生改变！！！！！！！！！！');
     print('customGoods'+customGoods);
     print('BytedeskUtils.goodsInfo.value'+BytedeskUtils.goodsInfo.value);
-    if(customGoods==BytedeskUtils.goodsInfo.value)
-      return;
     customGoods = BytedeskUtils.goodsInfo.value;
     print('BytedeskUtils.goodsInfo.value'+BytedeskUtils.goodsInfo.value);
 
-
     _goodsSubmitted();
   }
 
   @override
   void initState() {
 
-    BytedeskUtils.goodsInfo.addListener(() {
+    BytedeskUtils.goodsInfo.addListener(
-
+      submit
-      submit;
+    );
-
-
-    });
 
 
     if(widget.btnBack==null){
@@ -1555,7 +1549,7 @@ class _ChatKFPageState extends State<ChatKFPage>
     _debounce?.cancel();
     _loadHistoryTimer?.cancel();
     _resendTimer?.cancel();
-    BytedeskUtils.goodsInfo.removeListener(() {  submit;});
+    BytedeskUtils.goodsInfo.removeListener( submit);
     // bytedeskEventBus.destroy(); // FIXME: 只能取消监听，不能destroy
     super.dispose();
   }