fix：【我的页-增值服务-实名认证 首次购买后点左上箭头退不到APP,在购物车是空的和订单提交成功界面来回切换（首次买高级功能一样）】

https://www.tapd.cn/69273997/bugtrace/bugs/view/1169273997001002869

lib/tools/titleAppBar.dart

@@ -17,6 +17,7 @@ class TitleAppBar extends AppBar {
   final bool? haveOtherLeftWidget;
   final Widget? leftWidget;
   List<Widget>? actionsList;
+  final double? leadingWidth;
 
   TitleAppBar(
       {Key? key,
@@ -30,6 +31,7 @@ class TitleAppBar extends AppBar {
       this.haveBack,
       this.backAction,
       this.haveOtherLeftWidget = false,
+      this.leadingWidth,
       this.leftWidget})
       : super(key: key);
 
@@ -42,6 +44,7 @@ class _TitleAppBarState extends State<TitleAppBar> {
   Widget build(BuildContext context) {
     return AppBar(
         elevation: 0,
+        leadingWidth: widget.leadingWidth,
         leading: widget.haveOtherLeftWidget!
             ? widget.leftWidget
             : (widget.haveBack ?? false