Fix branding logo URL path
Fix branding logo URL path

The current method adds an additional slash to the URL which results in the logo request producing a 404 error on for Storage drivers like S3 and GCS that don't automatically collapse additional forward slashes into single slashes.

E.g. with the current code my logo URL renders like `https://storage.googleapis.com/mybucketname/public//setting-logo-Al0aKMhmYz.svg` (note the double slash after "public") when instead it should render like `https://storage.googleapis.com/mybucketname/public/setting-logo-Al0aKMhmYz.svg`

For a local driver this should work fine since webservers handle the additional slashes case, but for key-based storage this 404s.

Thanks for your work on Snipe-It, seems like a good system so far!
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