:::There is no need to edit the template, it is correct as stands see below.    
 :(edit conflict) The article is using the . When a building was formerly the world's tallest, the text you are questioning is automatically generated by the Infobox coding and uses the article title in the automatic text. It is correct as it stands because it is using the past tense in the context of the infobox which shows the current name and information. This is different from historical references in the article text, where it is written using "Sears Tower" to describe events at the time they occurred.