Correctly update "list all tabs" menu if there is pinned tabs

[Infocatcher]

Also may be fixed using following way:

        var startPos = tabs.length - items.length; // Pinned tabs aren't displayed in menu
        for (let i = startPos, maxi = tabs.length; i < maxi; i++)
        {
            items[i - startPos].style.marginLeft = tabs[i].getAttribute(this.kNEST)+'em';
        }

But using of built-in tab property is better, I think.

[piroor]

Thanks a lot!!