Fix arg shadowing in get_or_create_klant_for_new_user #8393

Job	Run time
Check that documentation for configuration steps is up-to-date	0s
End-to-end tests, chromium	3m 59s
Run the Django test suite (main)	19m 47s
Build and check documentation	1m 51s
End-to-end tests, firefox	4m 49s
Run the Django test suite (elastic)	4m 55s
End-to-end tests, webkit	4m 24s
Run the Django test suite (openklant)	2m 12s
End-to-end tests, msedge	4m 51s
Run the Django test suite (sequential)	3m 48s
Build (and push) Docker image	1m 49s
Upload coverage information to codecov	18s
	52m 43s

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