Reconcile how edit vs audit descriptions are looked up.

Per [74061822](https://www.pivotaltracker.com/story/show/74061822) regarding failure of audit and all edits on DEV.  Problem was traced to an earlier effort to account for response titles being in iFrames, which made edit tests fail when titles were treated like descriptions, as they are for responses.

Fixed by having PBC response dictionary alone treat titles as descriptions, which results in the right expectations.