Nginx cronjob improvements

1. Commit adbc4bc:
Take the corresponding authname instead of the constant string "Restricted area".

2. Commit 8842c02:
Fixes wrong indentation of location-blocks, when basic auth is used (bug introduced in c6ed0b6).
To give an example:
...
location /subfolder/ {
    auth_basic "realname";
    auth_basic_user_file /etc/nginx/froxlor-htpasswd/2-a2d3f4g5h6.htpasswd;
}location ~ \.php {
    fastcgi_split_path_info ^(.+\.php)(/.+)$;
...