[#711] Fix multiple zaaktype versions being used in configuration #1945

Job	Run time
Run the Django test suite	2m 6s
Build and check documentation	1m 6s
Build frontend	1m 10s
Build docker image (dev, -dev, dev) / Build image	1m 57s
Build docker image (production, docker) / Build image	1m 57s
Run storybook tests	2m 50s
End-to-end tests, chromium	6m 5s
End-to-end tests, firefox	7m 46s
End-to-end tests, webkit	7m 8s
Push Docker image	0s
	32m 5s

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