Fix missing line return in nginx config

docker/apps/nginx.conf

@@ -24,7 +24,8 @@ server {
 
     # Security headers
     add_header Strict-Transport-Security "max-age=31536000" always; # force browser to switch to HTTPS (for 1 year)
-    add_header X-Content-Type-Options "nosniff"; # prevent MIME type sniffing (i.e. believe `Content-Type` specified by server)  }
+    add_header X-Content-Type-Options "nosniff"; # prevent MIME type sniffing (i.e. believe `Content-Type` specified by server)
+  }
 
   location ~* \.(?:css|js)$ {
     add_header 'Access-Control-Allow-Origin' '*';