Show title of closed topics

Only hide .flow-content-modified-tipsy-link when closed.
This is the simplest fix, there are more display improvements possible.
https://trello.com/c/NQMHgbXS/202-closed-collapsed-threads-show-title-of-thread

Change-Id: I954e2756877b99687685e2469b1abc8a1921e460
Merge "Show title of closed topics"