Rename 'view-interdiff' url to 'view_interdiff'

Review Request #4745 — Created Oct. 14, 2013 and submitted — Latest diff uploaded

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Review Board
master

Reviewers

Rename 'view-interdiff' url to 'view_interdiff'

Most of our other views (and all of the other diff-related views) use
underscores in the URL names. This change just makes us consistent.