For non-surveys, change val[0] to val

For downloading of CSV-submissions to work, it needs to report
the entirety of the submitted values, not just the first character.
Removed	special	case for surveys in view_submissions_to_grade

Since we don't use it for survey reporting anyway, I don't believe
Merge pull request #2097 from Stanford-Online/jbau-csv-fix

For non-surveys, change val[0] to val