Remove try_files that was causing issues

This 'try_files' was probably originally put in as a security measure against maliciously uploaded static objects that would be then executed as php. See here https://nealpoole.com/blog/2011/04/setting-up-php-fastcgi-and-nginx-dont-trust-the-tutorials-check-your-configuration/

This is not needed because 'fastcgi_split_path_info' line already guarantees only the intended php file is passed to PHP as the SCRIPT_FILENAME.