fix missing semi colon

Author: ltp

jellyfin.subdomain.conf.sample

@@ -43,7 +43,7 @@ server {
     location /jellyfin/metrics {
         allow 192.168.0.0/16;
         allow 10.0.0.0/8;
-        allow 172.16.0.0/12
+        allow 172.16.0.0/12;
         allow 127.0.0.0/8;
 
         deny all;