wger: Use $http_host for proxy Host header

Update the nginx config to set the proxied Host header from $http_host instead of $host. This preserves the original Host header sent by the client (including port) when forwarding requests, avoiding mismatches that can occur when $host omits the port or falls back to server_name.

install/wger-install.sh

@@ -164,7 +164,7 @@ server {
 
     location / {
         proxy_pass http://127.0.0.1:8000;
-        proxy_set_header Host $host;
+        proxy_set_header Host $http_host;
         proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
         proxy_set_header X-Forwarded-Proto $scheme;
         proxy_redirect off;