Problem: Absolute path required with -r

[wq9578]

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The standalone validator requires specifying an absolute path, which should be avoided. See No. 3 here: https://github.com/itplr-kosit/validator-configuration-xrechnung/issues/80

Issue formerly mentioned here: https://github.com/itplr-kosit/validator/issues/94#issuecomment-1370916761 Opened new issue here as suggested at: https://github.com/itplr-kosit/validator-configuration-xrechnung/issues/80#issuecomment-1372380597