[skerbis]

Summary

• Deselecting every option in the "AddOn Pages Favorites" or category favorites multi-select and saving didn't actually clear the setting — the old selection kept coming back.
• Cause: an empty <select multiple> isn't submitted at all by browsers, so quick_navigation_favs<id>/quick_navigation_addon_favs<id> were simply absent from the POST payload, and $package->setConfig($config) never touched (let alone cleared) those keys.
• Fix mirrors the existing normalization already in place for quick_navigation_disabled_buttons<id>: default both to an empty array when missing from the submitted config before saving.

Test plan

• Selected entries in both "AddOn Pages Favorites" and category favorites, saved, reloaded — selection persisted correctly
• Cleared all selections in both fields, saved, did a full page reload — both fields are now empty (no stale selection reappearing)

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