Redirect sessions without trailing slash to session with trailing slash

[strazto]

Migrating from https://github.com/elisescu/tty-share/issues/34 , as I realized this redirection is handled by the proxy

Somewhat similar to: elisescu/tty-server#15

essentially, if i have the link tty-share.com/s/​<session_id>​/, if I click to tty-share.com/s/​<session_id> ​ , I get a 404

These urls should probably be treated as equivalent, as the default behaviour of many terminals does not include the trailing slash

[elisescu]

I had a comment in the PR. I think the change makes sense without the logging part :)