Fix missing newlines in nginx template

[zorun]

This change is only cosmetic but makes the nginx configuration more readable.

Before:

     listen [::]:443 ssl http2;      server_name nc.example.org;

After:

     listen [::]:443 ssl http2;
     server_name nc.example.org;

[ReinerNippes]

Hi zorun, thanks for the merge request. I was about to abandon the master branch. I rewrote everything and started a nextcloud-reloaded branch. I'll transfer your improvements there.
Could do your next Mr against the new branch?
Thanks.