fix(reportingData): 修复撤回申报数据的类型值错误

- 将 this.dropdownCode 替换为固定的 'cancellation' 字符串
- 确保在撤销对话框中提交的数据类型始终正确

@@ -131,7 +131,7 @@
           let obj = {
               cancellationReason: this.cancelFormData.otherReason || this.cancelFormData.cancellationReason,
               declareIds: [],
-              type: this.dropdownCode,
+              type: 'cancellation',
             };
             this.selectedDatas.forEach((item) => {
               obj.declareIds.push(item.declareId);
@@ -188,4 +188,3 @@
   }
 }
   </style>
-  
\ No newline at end of file