Update printer-lulzbot-taz6-2017.cfg

[fernplant]

Stock nozzle sizes for Lulzbot TAZ6 are 0.5mm

[JamesH1978]

Thanks for the PR, please refer to point 3 in "Common things a reviewer will look for:" section in https://github.com/Klipper3d/klipper/blob/master/docs/CONTRIBUTING.md and provide a signed-of-by line

Thanks James

[github-actions[bot]]

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