fix metrics path

Author: ltp

jellyfin.subdomain.conf.sample

@@ -40,7 +40,7 @@ server {
 
     # Restrict access to /metrics
     # https://jellyfin.org/docs/general/networking/monitoring/#prometheus-metrics
-    location /jellyfin/metrics {
+    location /metrics {
         allow 192.168.0.0/16;
         allow 10.0.0.0/8;
         allow 172.16.0.0/12;