[BUG] Fix spacing between buttons in kirby-page-actions

[jakobe]

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Describe the bug

PR #3073 removed margin on buttons in page actions, but didn't add flex+gap to kirby-page-actions as in kirby-action-group.

Describe how to reproduce the bug

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❌ Current behaviour:

✅ Expected behaviour:

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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Verification

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