多选bug修复

src/views/accounting/invoices/index.vue

@@ -1122,10 +1122,10 @@ export default {
       this.ids = selection.map((item) => item.id);
       if (selection.length == 1) {
         this.multiple = false;
+        this.form = selection[0];
       } else {
         this.multiple = true;
       }
-      this.form = selection[0];
     },
     /** 新增按钮操作 */
     handleAdd() {