Corrected path for printer.cfg

[c15yi]

Looks like the path for printer.cfg changed a while ago according to this forum post.

[JamesH1978]

Thank you for submitting a PR, please be aware that you need to sign off to accept the developer certificate of origin, please see point 3 in https://github.com/Klipper3d/klipper/blob/master/docs/CONTRIBUTING.md#what-to-expect-in-a-review

You also have a whitespace issue you need to clear up, so the build checks can pass.

Thanks James

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