Always show the first slide first (issue on chrome)

This patch fixes an issue I was having in chrome with infinite loop. The last slide was always shown first. It worked fine on safari and firefox. It seems that, when the bx-clone elements are added, their height is 0 in chrome, and this somehow causes setPositionProperty to be called with 0 in the snippet below:

	// get the position of the first showing slide
	var position = slider.children.eq(slider.active.index * getMoveBy()).position();
	// check for last slide
	if (slider.active.index == getPagerQty() - 1) slider.active.last = true;
	// set the repective position
	if (position != undefined){
		if (slider.settings.mode == 'horizontal') setPositionProperty(-position.left, 'reset', 0);
		else if (slider.settings.mode == 'vertical') setPositionProperty(-position.top, 'reset', 0);
	}

Setting the height to 1 (or actually any value) prevents such issue. Ugly but it solves the problem.