修复表单组件样式和单元测试用例 (#7)

* fix: loading small style, search style and dialog style

* fix: scroll to top

* fix mobile scroll

* fix scroll to top

* 文档细节优化

* unit test

* dialog and image-preview unit test

* fix form component style

* fix radio and checkbox style

* fix search component style

packages/vant-css/scripts/fount-config.js

@@ -36,7 +36,8 @@ module.exports = {
     {
       keywords: ['location'],
       src: '其他分店.svg',
-      css: 'location'
+      css: 'location',
+      'correct_contour_direction': true
     },
     {
       keywords: ['upgrade'],
@@ -97,7 +98,8 @@ module.exports = {
     {
       keywords: ['logistics'],
       src: '物流.svg',
-      css: 'logistics'
+      css: 'logistics',
+      'correct_contour_direction': true
     },
     {
       keywords: ['edit'],