[BUG] List: spacing between sections is missing

[jakobe]

• [x] I have written a good issue

Describe the bug

After #3349 the spacing between items is missing — see screenshot below 👇🏻

Describe how to reproduce the bug

1. Go to https://cookbook.kirby.design/#/examples/list/with-sections
2. See spacing between sections is missing

Which Kirby version was used?

>=9.4.0

What was the expected behavior?

List sections should have 24px spacing between them.

Add any screenshots

❌ Wrong:

✅ Correct:

Please complete the following information:

• OS: [e.g. Windows, MacOS, iOS]
• Browser [e.g. Chrome, Safari]
• Browser version [e.g. 22]

Are there any additional context?

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Checklist:

The following tasks should be carried out in sequence in order to follow the process of contributing correctly.

Verification

To make sure the bug is not intended behaviour; it should be verified by a member of team Kirby before moving on to implementation.

• [ ] Make sure the NOT verified label has been removed by a member of team Kirby; do not proceed until this is done.

Implementation

The contributor who wants to implement this issue should:

• [ ] Make sure you have read: "Before you get coding".
• [ ] Signal to others you are working on the issue by assigning yourself.
• [ ] Create a branch from the develop branch following our branch naming convention.
• [ ] Create a test that reproduces the bug following guidelines in: "The good: Test".
• [ ] Write code to fix the bug

Review

Once the issue has been implemented and is ready for review:

• [ ] Do a self-review.
• [ ] Create a pull-request.