[#711] Fix multiple zaaktype versions being used in configuration #1944

Job	Run time
Run the Django test suite	2m 5s
Build and check documentation	1m 26s
Build frontend	1m 7s
Build docker image (dev, -dev, dev) / Build image	1m 52s
Build docker image (production, docker) / Build image	1m 58s
End-to-end tests, chromium	6m 21s
Run storybook tests	2m 32s
End-to-end tests, firefox	7m 43s
End-to-end tests, webkit	7m 16s
Push Docker image	0s
	32m 20s

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