update constructor of loaders to take a system id

src/loaders/ApiBasedShuttleRepositoryLoader.ts

@@ -15,10 +15,10 @@ export class ApiResponseError extends Error {
  * which inherit from `IEntityWithId`.
  */
 export class ApiBasedShuttleRepositoryLoader implements ShuttleRepositoryLoader {
-  systemId = "263";
   baseUrl = "https://passiogo.com/mapGetData.php";
 
   constructor(
+    public systemId: string,
     public repository: ShuttleGetterSetterRepository,
   ) {
   }