chore(nginx): update configuration to remove deprecated directives.

Found during nginx update on the server:

Setting up nginx (1.16.1-1~xenial) ...
nginx: [warn] the "ssl" directive is deprecated, use the "listen ... ssl" directive instead in /etc/nginx/conf.d/mystamps-ssl.conf:13
nginx: [warn] the "ssl" directive is deprecated, use the "listen ... ssl" directive instead in /etc/nginx/conf.d/mystamps-static.conf:8

See also:
https://stackoverflow.com/questions/51703109/nginx-the-ssl-directive-is-deprecated-use-the-listen-ssl

[skip ci]

Author: php-coder

src/main/config/nginx/mystamps-ssl.conf

@@ -4,13 +4,12 @@ map $http_accept_language $lang {
 }
 
 server {
-  listen 443 default_server;
+  listen 443 ssl default_server;
   server_name my-stamps.ru www.my-stamps.ru;
   server_tokens off;
   error_log /data/logs/nginx.log notice;
   proxy_buffers 128 4k;
 
-  ssl on;
   ssl_certificate /etc/ssl/my-stamps.ru.crt;
   ssl_certificate_key /etc/ssl/my-stamps.ru.key;
 

src/main/config/nginx/mystamps-static.conf

@@ -1,11 +1,10 @@
 server {
-  listen 443;
+  listen 443 ssl;
   server_name stamps.filezz.ru;
   server_tokens off;
   error_log /data/logs/nginx-static.log notice;
   proxy_buffers 128 4k;
 
-  ssl on;
   ssl_certificate /etc/ssl/my-stamps.ru.crt;
   ssl_certificate_key /etc/ssl/my-stamps.ru.key;