fix: example zplData

example/lib/main.dart

   Future<void> printZplOverBluetooth() async {
     print('invoked printZplOverBluetooth from dart');
     try {
-      await _flutterZsdkPlugin.printZplOverBluetooth("^XA^PW624^LL800^FO20,20^A0N,25,25^FDThis is a ZPL test.^FS^FO20,60^BQ ,2,10 , , , A ^FDQA,http://192.168.102.170:4218/?q=IDC4C321S023^FS^^FO20,320^A0N,25,25^FDDart Zpl Test.^FS^XZ");
+      await _flutterZsdkPlugin.printZplOverBluetooth("^XA^PW624^LL800^FO20,20^A0N,25,25^FDThis is a ZPL test.^FS^FO20,60^BQ ,2,10 , , , A ^FDQA,http://192.168.102.170:4218/?q=IDC4C321S023^FS^^FO20,500^A0N,25,25^FDDart Zpl Test.^FS^XZ");
       print('printZplOverBluetooth successfully from dart');
       
     } on FlutterZsdkException catch (e) {