Remove rule for SL.se since it breaks their site

The new site for SL.se redirects all https requests to http and therefore HTTPS everywhere breaks the javascript functionality on their site.

```
$ curl -D - https://sl.se   
HTTP/1.1 302 Found
Cache-Control: private, max-age=0, s-maxage=0
Content-Type: text/html; charset=utf-8
Location: http://sl.se/
Server: Microsoft-IIS/7.5
Set-Cookie: ASP.NET_SessionId=tfyog1cyeskx0ma0iafai2tk; path=/; HttpOnly
X-AspNetMvc-Version: 4.0
X-AspNet-Version: 4.0.30319
X-Powered-By: ASP.NET
Date: Tue, 29 Jul 2014 12:01:18 GMT
Content-Length: 130

<html><head><title>Object moved</title></head><body>
<h2>Object moved to <a href="http://sl.se/">here</a>.</h2>
</body></html>
```