VID-1821 Tweaks to when to show info icon

There's a few things wrong here. 
1) There's more than one "infobox" class, including "wikia-infobox" and one other one I'd have to look up. 
2) I don't think we should take tables into consideration when showing the info icon or not. If the element is properly self-contained it shouldn't matter if it's inside a table or not. In the example provided in the ticket (http://zh.tos.wikia.com/wiki/%E5%85%88%E6%94%BB), adding "display: inline-block" to .article-thumb-wrapper puts the icon in the correct place.