(Bug 5073) Remove tabindex for foundation account links

We no longer use the table-based method, but two divs side-by-side. This
means that the source is ordered according to the desired tab order
(through all the form fields first, before the links to the side), so
tabindex is redundant! Removing to reduce future confusion. Also because
it's nice.
(Bug 5073) Focus on the revealed modal when it opens
Merge pull request #624 from afuna/tabindex-focus-bug5073

Tabindex/ focus on account links modal