Fix default params in BitmapGRF methods

[Cellivar]

I'm going to bed.

[github-actions]

➿ Code coverage

Filename	Statements	Branches	Functions	Lines
src/Documents/BitmapGRF.ts	52.55%	51.35%	66.67%	53.78%
src/WebZlpError.ts	33.33%	100%	50%	33.33%
src/index.ts	100%	100%	100%	100%
src/Documents/Commands.ts	28.41%	43.33%	11%	11.35%
src/Printers/Configuration/PrinterOptions.ts	26.32%	66.67%	6.67%	12.5%
src/Printers/Models/PrinterModel.ts	38.1%	18.18%	11.11%	13.33%
src/Printers/Configuration/SerialPortSettings.ts	97.06%	100%	85.71%	85.71%
src/Printers/Configuration/MediaOptions.ts	69.23%	33.33%	62.5%	20%
src/Documents/ConfigDocument.ts	34.38%	0%	35.29%	34.38%
src/Documents/Document.ts	40.91%	0%	33.33%	45%
src/Documents/LabelDocument.ts	52%	69.23%	29.41%	45.45%
src/Documents/ReadyToPrintDocuments.ts	27.27%	100%	0%	22.22%
src/Printers/Communication/LineBreakTransformer.ts	0%	100%	0%	0%
src/Printers/Communication/PrinterCommunication.ts	76.92%	50%	50%	50%
src/Printers/Communication/UsbPrinterDeviceChannel.ts	4.23%	0%	0%	4.23%
src/Printers/Languages/EplPrinterCommandSet.ts	13.73%	13.85%	12.5%	14.38%
src/Printers/Models/PrinterModelDb.ts	11.54%	0%	0%	11.54%
src/Printers/Models/EplPrinterModels.ts	15.38%	100%	0%	15.38%
src/Printers/Languages/PrinterCommandSet.ts	20.41%	6.25%	17.24%	19.35%
src/Printers/PrinterCommunicationOptions.ts	0%	100%	0%	0%
src/Printers/Printer.ts	10.48%	0%	0%	10.58%
src/Printers/Languages/ZplPrinterCommandSet.ts	3.62%	0%	0%	3.65%
src/PrinterUsbManager.ts	4.35%	0%	0%	4.55%