Remove include directive in ssl.example.com

To include the SSL related directives in the port 80 server block seems to be redundant.
Because all incoming traffic via port 80 is explicit redirected 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
* FF 33, Chrome 38, Safari 7