Remove double dhparam definition.

install/deb/nginx/nginx.conf

@@ -103,9 +103,6 @@ http {
     #set_real_ip_from  2a06:98c0::/29;
     real_ip_header     CF-Connecting-IP;
 
-    # SSL dhparam.pem
-    ssl_dhparam /etc/ssl/dhparam.pem;
-
     # SSL PCI Compliance
     ssl_session_cache   shared:SSL:10m;
     ssl_protocols       TLSv1.1 TLSv1.2 TLSv1.3;