small adjustment to ph thumb proxy

src/providers/pornhub.rs

@@ -926,8 +926,8 @@ impl PornhubThumbPolicy {
             return false;
         }
         let Some(host) = url.host_str() else { return false; };
-        // Allow official Pornhub hosts and their CDN hosts
+        // Only allow the specific Pornhub CDN host used for thumbnails
-        host.contains("phncdn") || host.ends_with("pornhub.com")
+        host.eq_ignore_ascii_case("pix-cdn77.phncdn.com")
     }
 }