20220920 fix 後台匯出功能

app/Http/Controllers/Backend/DataManagement/SignupManagementController.php

             ];
         }
 
-        SimpleExcelWriter::streamDownload('報名資訊.xlsx')
+        SimpleExcelWriter::streamDownload('報名資料'.date('Ymd').'.xlsx')
             ->addRows($rows)
             ->toBrowser();
     }