Fix searching for screenshot/file attachment comment text in the admin UI.
Review Request #6496 — Created Oct. 23, 2014 and submitted
We were referencing incorrect fields in the admin UI for the search
field used to search screenshot and file attachment comments. We now
reference the correct field, restoring search functionality.
Tested searching for comment text, and didn't see any breakages.
Tool: Pyflakes Processed Files: reviewboard/reviews/admin.py Tool: PEP8 Style Checker Processed Files: reviewboard/reviews/admin.py