Add fallback for Max 4 series ID matching

The Qidi Max 4 doesn't report that it's a Qidi Max 4 via /server/info
like the other Qidi printers apparently do.  This means that filament
matching is a fool's erand because you'll never actually match anything.
this adds a fallback where we just use the configured machine type.  I'm
not sure why we wouldn't just do that all the time, but I wanted to
change as little as possible.

src/slic3r/Utils/QidiPrinterAgent.cpp

@@ -50,6 +50,10 @@ bool QidiPrinterAgent::fetch_filament_info(std::string dev_id)
             series_id = infer_series_id(info.model_id, info.dev_name);
         }
     }
+    if (series_id.empty()) {
+        // Fall back to the configured Orca model if Moonraker doesn't expose a usable identifier.
+        series_id = infer_series_id(device_info.model_id, device_info.model_name);
+    }
 
     // 2. Fetch filament dictionary
     QidiFilamentDict dict;