完善青少年模式交互，完善注销账号交互

lib/pages/setting/deactivate_page.dart

@@ -125,7 +125,7 @@ class DeactivatePage extends StatelessWidget {
                         double> animation,
                         Animation<double> secondaryAnimation) {
                       return TDAlertDialog(
-                          title: '是否退出当前账号？',
+                          title: '是否注销当前账号？',
                           buttonWidget: Container(
                             padding: EdgeInsetsGeometry.only(top: 16.w,
                                 right: 30.w,