Parameters in test definition not saved

[JanPeterDatakind]

Describe the bug
When a test that uses parameters (e.g. accepted values) is defined through the UI, parameters can be entered, but the resulting entry in the dot.configured_tests table does not contain these parameters.

To Reproduce
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2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
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Screenshots
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Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context
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