Fix the FileAttachment.uuid evolution to match the model field.
Review Request #8141 — Created May 2, 2016 and submitted
The evolution that was included in the existing code didn't match the
definition of the field. This is a very simple fix.
Ran evolutions.
Tool: Pyflakes Processed Files: reviewboard/attachments/evolutions/file_attachment_uuid.py Tool: PEP8 Style Checker Processed Files: reviewboard/attachments/evolutions/file_attachment_uuid.py