优化：订单列表页操作按钮间距

pages/order/index.vue

@@ -526,11 +526,16 @@
       .btn-item {
         border-radius: 10rpx;
         padding: 6rpx 20rpx;
+        margin-left: 15rpx;
         font-size: 28rpx;
         float: right;
         color: #383838;
         border: 1rpx solid #a8a8a8;
 
+        &:last-child {
+          margin-left: 0;
+        }
+
         &.active {
           color: $uni-text-color-active;
           border: 1rpx solid $uni-text-color-active;