[hueemulation] Fix nginx example configuration (#9550)

bundles/org.openhab.io.hueemulation/README.md

@@ -158,12 +158,14 @@ You must either
   ```
   server {
     listen 80;
+    location / {
       proxy_pass                              http://localhost:8080/;
       proxy_set_header Host                   $http_host;
       proxy_set_header X-Real-IP              $remote_addr;
       proxy_set_header X-Forwarded-For        $proxy_add_x_forwarded_for;
       proxy_set_header X-Forwarded-Proto      $scheme;
     }
+  }
   ```
 * or let openHAB run on port 80 (the entire java process requires elevated privileges).