list-base: Fix double click issue in gesture handling

Double clicking a folder will cause the deny_background_click flag to remain TRUE thereby breaking the ability to left or right click on background (to clear selection or popup context menu). This happens because the new view is activated before on_item_click_stopped() is called after the second click.

In on_item_click_pressed() set deny_background_click and activate_on_release only if there's not a special condition that is already claiming the event.