DOI link not present in issue TOC on journal index page

[jnugent]

Describe the bug
The link to an article's DOI used to be present on the front page of the journal, in the current issue TOC prior to 3.3. It can be brought back by adding an extra test here:

https://github.com/pkp/healthSciences/blob/stable-3_3_0/templates/frontend/objects/article_summary.tpl#L74

with $requestedPage === "index" ||

Which will work fine.