Revert "feat: 增加border更新例子"

This reverts commit a1089139.

pages/CSS/border/border-update.uvue

-<template>
-	<!-- #ifdef APP -->
-	<scroll-view style="flex:1">
-	<!-- #endif -->
-		<view>
-			<button @click="handleUpdate">点击更新border样式</button>
-			<view class="border-view" :style="borderStyle"></view>
-		</view>
-	<!-- #ifdef APP -->
-	</scroll-view>
-	<!-- #endif -->
-</template>
-
-<script setup>
-	let borderStyle = ref("border:3px solid red;")
-	const handleUpdate = () => {
-		borderStyle.value = "border:7px solid red;"
-	}
-</script>
-
-<style>
-	.border-view {
-		width: 150px;
-		height: 150px;
-	}
-</style>