fix: respect capture_on_queue flag in WebcamCapture.IS_CHANGED

When capture_on_queue is True, the node should always re-execute on
each queue operation. Previously IS_CHANGED ignored this flag and always
returned the file hash, causing the node to be skipped if the cached
image hadn't changed on disk - defeating the purpose of the option.

comfy_extras/nodes_webcam.py

@@ -26,6 +26,8 @@ class WebcamCapture(nodes.LoadImage):
 
     @classmethod
     def IS_CHANGED(cls, image, width, height, capture_on_queue):
+        if capture_on_queue:
+            return float("NaN")
         return super().IS_CHANGED(image)