修复sku错误文案显示，增加sku-body-top slot，增加resetSelectedSkuOnHide参数

docs/demos/mock/sku.js

@@ -366,7 +366,7 @@ export default {
           extend: null,
           kdt_id: 55,
           discount_price: 0,
-          stock_num: 6,
+          stock_num: 4,
           stock_mode: 0,
           is_sell: null,
           combin_sku: false,
@@ -506,7 +506,7 @@ export default {
     alias: '2oml0r0n5vytj',
     quota: 15,
     is_virtual: '0',
-    quota_used: 0,
+    quota_used: 1,
     goods_info: {
       title: 'Goods Name',
       picture: 'https://img.yzcdn.cn/upload_files/2017/03/16/Fs_OMbSFPa183sBwvG_94llUYiLa.jpeg?imageView2/2/w/100/h/100/q/75/format/jpg',

docs/demos/views/sku.vue

@@ -11,6 +11,7 @@
           :quota="$t('sku').quota"
           :quota-used="$t('sku').quota_used"
           :reset-stepper-on-hide="true"
+          :reset-selected-sku-on-hide="true"
           :disable-stepper-input="true"
           @buy-clicked="handleBuyClicked"
           @add-cart="handleAddCartClicked"