refactor: drop the last argument from procfile-get-command

No external plugin should need to know the internals of where processes are.

plugins/ps/src/triggers/triggers.go

@@ -62,7 +62,7 @@ func main() {
 		processType := flag.Arg(1)
 		port := common.ToInt(flag.Arg(2), 5000)
 		procfilePath := flag.Arg(3)
-		err = ps.TriggerProcfileGetCommand(appName, processType, port, procfilePath)
+		err = ps.TriggerProcfileGetCommand(appName, processType, port)
 	case "procfile-remove":
 		appName := flag.Arg(0)
 		procfilePath := flag.Arg(1)