dnsexit2: Remove https:// from update service URL

This allows the `ssl` setting to control TLS vs. plain HTTP, and makes
it possible to create a compatible service that doesn't use TLS (e.g.,
for testing).

ddclient.in

@@ -4190,7 +4190,7 @@ sub nic_dnsexit2_update {
                 ttl => $config{$h}{'ttl'},
             });
         };
-        my $url = "https://$config{$h}{'server'}$config{$h}{'path'}";
+        my $url = $config{$h}{'server'} . $config{$h}{'path'};
         my $reply = geturl(
             proxy => opt('proxy'),
             url => $url,