archwiki/templates/nginx.d.conf.j2: fix access to MediaWiki extension assets

Various files in /extensions/ need to be accessible for extensions to work.

Based on example from https://www.mediawiki.org/wiki/Manual:Short_URL/Nginx.

Fixes #355 (closed).

roles/archwiki/templates/nginx.d.conf.j2

@@ -122,13 +122,13 @@ server {
         limit_req zone=archwikilimit burst=10 nodelay;
     }
 
-    # MediaWiki assets (usually images)
+    # MediaWiki assets
     location ~ ^/(?:images|resources/(?:assets|lib|src)|(?:skins|extensions)/.+\.(?:css|js|gif|jpg|jpeg|png|svg|wasm)$) {
         expires 30d;
         add_header Pragma public;
         add_header Cache-Control "public, must-revalidate, proxy-revalidate";
     }
-    location /w/images/deleted {
+    location /images/deleted {
         # Deny access to deleted images folder
         deny all;
     }