fix: write the cron config after the app.json has been deleted

Without this, we try to write the config for the app even though it doesn't exist anymore, causing issues with deleting apps with invalid cron configs.

plugins/cron/src/triggers/triggers.go

@@ -40,9 +40,6 @@ func main() {
 	case "post-delete":
 		appName := flag.Arg(0)
 		err = cron.TriggerPostDelete(appName)
-	case "pre-delete":
-		appName := flag.Arg(0)
-		err = cron.TriggerPreDelete(appName)
 	case "report":
 		appName := flag.Arg(0)
 		err = cron.ReportSingleApp(appName, "", "")