20220914 新增議程可報名人數

app/Http/Services/Api/SeminarSignUpService.php

                 
             ])
             ->leftJoin('signupData', 'trackData.trackNo', '=', 'signupData.trackNo')
-            ->groupBy('signupData.trackNo')
+            ->groupBy('trackData.trackNo')
             ->get();
 
         // 整理返回值並返回