[FS#325] download statistics page is 404

[LEDE Bugs]

The following task has a new comment added:

FS#325 - download statistics page is 404
User who did this - Ted Hess (thess)

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I think I fixed this -- nginx location block processing is not all that obvious.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=325#comment1706