[BUG] Action Group doesn't update when changing visibleActions

[jakobe]

• I have written a good issue

Describe the bug

Action Group supports setting visibleActions, but it only works on init, it doesn't update the visible and collapsed buttons when changing the prop after init.

Describe how to reproduce the bug

1. Add a kirby-action-group to a component's markup with 5 buttons, set visibleActions to 2.
2. Update visibleActions after init (e.g. using a timeout or reacting to screen resize). Set visibleActions to 4.
3. See no changes happen

Which Kirby version was used?

8.6.0

What was the expected behavior?

• When updating visibleActions to a higher number than the initial number (e.g. from 2 -> 4) it should reveal those additional buttons
• When updating visibleActions to a lower number than the initial number (e.g. from 4 -> 2) it should collapse those additional buttons

Add any screenshots

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?

No.

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• Write code to fix the bug

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