修复加一单显示不了的问题

pages/orderDetailNew/index.vue

@@ -2,7 +2,7 @@
     <view>
         <!-- 正确使用 u-navbar 的具名插槽 -->
         <u-navbar :autoBack="true" :placeholder="true" v-hideNav>
-            <template v-slot:center>
+            <template slot="center">
                 <view class="slot-wrap">
                     <text @click="handleBrandClick" class="brand">{{ topInfo.brand }}</text>
                     <text class="divider">|</text>
@@ -11,7 +11,7 @@
                     <text @click="handlePriceClick" class="price">¥{{ topInfo.price }}</text>
                 </view>
             </template>
-            <template v-slot:right>
+            <template slot="right">
                 <view class="slot-right" @click="handleAddClick">
                     <image src="/static/icons/plus.png" mode="scaleToFill" />
                     <text>加一单</text>