fix(RewardDetail): 修正分享功能中的积分字段和图片字段

将分享标题中的积分字段从points改为points_cost，图片字段从image改为banner以匹配后端数据

@@ -249,9 +249,9 @@ useLoad((options) => {
  */
 const onShareAppMessage = () => {
     return {
-        title: `${reward.value.title} - 仅需${reward.value.points}积分`,
+        title: `${reward.value.title} - 仅需${reward.value.points_cost}积分`,
         path: addShareFlag(`/pages/RewardDetail/index?id=${reward.value.id}`),
-        imageUrl: reward.value.image
+        imageUrl: reward.value.banner
     }
 }