Extra slash in the redirection when redirecting to HTTPS when using Let's Encrypt

[gregkare]

• Gitea version (or commit ref): master
• Git version: not relevant
• Operating system: macOS, Linux
• Database (use [x]):
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• Can you reproduce the bug at https://try.gitea.io:
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Description

When Let's Encrypt is enabled, the redirections from HTTP to HTTPS add an extra slash at the end of the URL. I have identified the problem and am going to push a PR.

$ curl 0.0.0.0:3001/
<a href="https://gitea.example.com:3000//">Found</a>.

$ curl 0.0.0.0:3001
<a href="https://gitea.example.com:3000//">Found</a>.

$ curl 0.0.0.0:3001/test
<a href="https://gitea.example.com:3000//test">Found</a>.