Bugfix: Resolve additional json being appended to downloaded files

What does this MR do and why?

Screenshots or screen recordings

The string {"status":"ok"} was being appended to files downloaded from the files tab. This removes the additional json information that was being appended to the file. Resolves #605

Before:

After:

How to set up and validate locally

Download a file from the files tab. Inspect that it matches the file that is present in the server and does not have additional data being appended.

MR acceptance checklist

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• Have you checked this doesn't interfere/conflict/duplicate someone elses work?
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• Have you resolved any lint issues?
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