fix 图书统计的排序问题

src/views/recycle/bookStat/index.vue

@@ -275,7 +275,7 @@
             minWidth: 100,
             formatter: (row) => row?.recycleTotalNumTime || 0,
             sortable: true,
-            columnKey: '4'
+            columnKey: '7'
         },
         {
             label: '最大回收量',