[#2946] Fix login for eHerkenning user with single vestiging #8365

Job	Run time
Build and check documentation	1m 52s
End-to-end tests, chromium	4m 4s
End-to-end tests, firefox	4m 14s
End-to-end tests, webkit	4m 32s
Check that documentation for configuration steps is up-to-date	0s
End-to-end tests, msedge	4m 25s
Run the Django test suite (main)	20m 6s
Run the Django test suite (elastic)	4m 44s
Run the Django test suite (openklant)	2m 19s
Upload coverage information to codecov	19s
Build (and push) Docker image	1m 43s
	48m 18s

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