Trim trailing & from query_string.

When trying to fetch an image file from the Cloud module, the default
nginx config will add a trailing & if there's no args specified.

Example:

https://example.com/cloud/username/some_image.png

This will be rewritten to:

https://example.com/index.php?q=/cloud/username/some_image.png&

This in turn will cause the Cloud module to try to redirect back to the
original because it does not match the query_string (in which the
ampersand has been converted to a question mark). And this will repeat
until the browser get's tired of it.

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