Fix: Remove double URL escape in HTTP::Server::Response.redirect
#13321
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fixes #13320
I tried to use the Oauth2::Client from Crystal it suggests to redirect the browser (https://github.com/crystal-lang/crystal/blob/master/src/oauth2/client.cr#L26-L28) after getting the authorization uri. The returned type is an URI already and thus encoded. In my case I was using it to connect to a keycloak, and I wondered, why keycloak doesn't accept the redirect_uri, then I noticed it was encoded twice.
This PR avoids encoding twice.