后台，答主类型

app/Admin/Controllers/Ask/BloggerTypeController.php

@@ -66,7 +66,7 @@ class BloggerTypeController extends AdminController
         return Form::make(new BloggerType(), function (Form $form) {
             $form->display('id');
             $form->text('title')->required();
-            $form->image('image')->url('files/uploads')->autoUpload()->required()->default(Settings::get('img_default_topic_avatar', 'https://img.mini.minisns.cn/images/topci/avatar.png'));
+            $form->image('image')->url('files/uploads')->autoUpload()->required();
             $form->number('sort')->default(0);