Fixed renamed and mode changed diff viewers not rendering on merge requests

What does this MR do?

Renders renamed and mode changed diff views for merge requests on the frontend.

Screenshot_2018-12-05_at_20.09.40

Screenshot_2018-12-05_at_20.09.36

What are the relevant issue numbers?

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/52607

Does this MR meet the acceptance criteria?

Edited by Phil Hughes

Merge request reports

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