Remove include directive in ssl.example.com

To include the SSL related directives in the port 80 server block seems to be redundant.
Because we are redirecting explicit all incoming traffic via port 80 to the HTTPS host on
port 443 where only the *secure-connection-magic* is happen.

Maybe I am missing something, but I tested the configuration
under the following system and encountered no negative side effects:

**Server**
* Ubuntu 14.04 LTS
* Nginx 1.7.7 mainline

**Client**
* OS X 10.9.5
* Browser: FF 33, Chrome 38, Safari 7

sites-available/ssl.example.com

@@ -8,8 +8,6 @@ server {
   # listen on both hosts
   server_name example.com www.example.com;
 
-  include h5bp/directive-only/ssl.conf;
-
   # and redirect to the https host (declared below)
   # avoiding http://www -> https://www -> https:// chain.
   return 301 https://example.com$request_uri;