table crash when selecting < 1st row (undefined offset)

[dantleech]

happens when selecting a non-existing row, should select the min/max

[dantleech]

        if ($event instanceof MouseEvent) {
            if ($event->kind === MouseEventKind::ScrollDown) {
                $this->selected--;
            }
            if ($event->kind === MouseEventKind::ScrollUp) {
                $this->selected++;
            }
        }