Close category panel after selection when "focus on load" is enabled
The "focus browse items on load" option moves focus to the first loaded
item. This is problematic when the category panel (sidebar) is collapsed
and user selected a category using keyboard: the app moves focus to the
browse item list, but category panel is still open. In other words,
focus moves to the widget under an overlay.
While the behavior after this patch is not the best one, it's the safest
and correct one, I believe.