adw-combo-row: Preserve focus when opening the popover

Lukáš Tyrychtr requested to merge tyrylu/libadwaita:comborow-focus into main

When the tab-behavior is set to gtk_list_tab_all, after a widget is shown, a tab key press is emulated to focus the list view. Because of that, the first item always gets focus.

Fix it by setting the property to gtk_list_tab_item, which fixes it, and it makes more sense from the point of keyboard navigation as well.

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