feat(BD的增送礼物页): 调整礼物天数，统一为3天

src/views/BDCenter/ItemDistribution.vue

@@ -94,7 +94,7 @@
           <img :src="selectedGoods.cover" alt="" style="width: 60%; margin: 5px 0" />
           <div style="font-weight: 600; margin: 10px 0">
             <span style="color: #00000080; margin-right: 10px">{{ t('validity') }}:</span>
-            <span style="font-weight: 700; color: #000">{{ validityPeriod }}{{ t('day') }}</span>
+            <span style="font-weight: 700; color: #000">3{{ t('day') }}</span>
           </div>
           <div
             style="
@@ -306,10 +306,6 @@ const productList = ref([])
 // 选中商品
 const selectedGoods = ref({})
 
-const validityPeriod = computed(() => {
-  return currentTab.value == 'VIP' ? '3' : '7'
-})
-
 const dialogshow = ref(false)
 // 展示弹窗
 const showSendDialog = (product) => {